Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 343 journals)
    - CERAMICS, GLASS AND POTTERY (30 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (212 journals)
    - METROLOGY AND STANDARDIZATION (5 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (36 journals)
    - RUBBER (3 journals)

MANUFACTURING AND TECHNOLOGY (212 journals)                  1 2     

Showing 1 - 73 of 73 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 35)
Additive Manufacturing     Hybrid Journal   (Followers: 18)
Advanced Composites and Hybrid Materials     Hybrid Journal   (Followers: 2)
Advanced Industrial and Engineering Polymer Research     Open Access   (Followers: 5)
Advanced Manufacturing: Polymer & Composites Science     Open Access   (Followers: 39)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 11)
Advances in Manufacturing     Hybrid Journal   (Followers: 6)
Advances in Manufacturing Science and Technology     Open Access   (Followers: 11)
Advances in Materials and Processing Technologies     Hybrid Journal   (Followers: 1)
Advances in Technology Innovation     Open Access   (Followers: 9)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Sensor Technology     Open Access   (Followers: 4)
Appita Journal: Journal of the Technical Association of the Australian and New Zealand Pulp and Paper Industry     Full-text available via subscription   (Followers: 16)
Applied Ergonomics     Full-text available via subscription   (Followers: 18)
Asia Pacific Biotech News     Hybrid Journal   (Followers: 3)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Australian Journal of Learning Difficulties     Hybrid Journal   (Followers: 5)
Australian TAFE Teacher     Full-text available via subscription   (Followers: 4)
Behavioral and Cognitive Neuroscience Reviews     Hybrid Journal   (Followers: 27)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bio-Design and Manufacturing     Hybrid Journal  
Biomanufacturing Reviews     Full-text available via subscription  
Biotechnology     Open Access   (Followers: 9)
Biotechnology Progress     Hybrid Journal   (Followers: 43)
Bulletin of Science, Technology & Society     Hybrid Journal   (Followers: 8)
CATTECH     Hybrid Journal   (Followers: 1)
Centaurus     Hybrid Journal   (Followers: 6)
China Foundry     Open Access  
Clay Technology     Full-text available via subscription  
Cold Regions Science and Technology     Hybrid Journal   (Followers: 4)
Comparative Technology Transfer and Society     Full-text available via subscription   (Followers: 4)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 28)
Composites Science and Technology     Hybrid Journal   (Followers: 245)
Comprehensive Therapy     Hybrid Journal   (Followers: 3)
Computer-Aided Design and Applications     Hybrid Journal   (Followers: 9)
Control Theory and Informatics     Open Access   (Followers: 10)
Control Theory and Technology     Hybrid Journal   (Followers: 2)
Cryoletters     Full-text available via subscription   (Followers: 4)
Current Protocols in Essential Laboratory Techniques     Full-text available via subscription  
Current Research in Nanotechnology     Open Access   (Followers: 26)
Decision Making : Applications in Management and Engineering     Open Access   (Followers: 1)
Decision Making in Manufacturing and Services     Open Access   (Followers: 1)
Design Journal : An International Journal for All Aspects of Design     Hybrid Journal   (Followers: 33)
Design Studies     Hybrid Journal   (Followers: 36)
Economics of Innovation and New Technology     Hybrid Journal   (Followers: 16)
Emerging Materials Research     Hybrid Journal   (Followers: 2)
Environmental Technology     Hybrid Journal   (Followers: 4)
FAC Journal of Systems and Control     Hybrid Journal   (Followers: 1)
Fibers     Open Access   (Followers: 7)
Fibers and Polymers     Full-text available via subscription   (Followers: 6)
FORMakademisk - forskningstidsskrift for design og designdidaktikk     Open Access   (Followers: 1)
Futures     Hybrid Journal   (Followers: 17)
Gender, Technology and Development     Hybrid Journal   (Followers: 11)
Green Materials     Hybrid Journal   (Followers: 3)
History and Technology: An International Journal     Hybrid Journal   (Followers: 11)
Human Factors in Design     Open Access   (Followers: 9)
i+Diseño : Revista científico-académica internacional de Innovación, Investigación y Desarrollo en Diseño     Open Access  
IEEE Engineering in Medicine and Biology Magazine     Full-text available via subscription   (Followers: 6)
IEEE Open Journal of Nanotechnology     Open Access   (Followers: 4)
IET Collaborative Intelligent Manufacturing     Open Access   (Followers: 2)
IETE Journal of Research     Open Access   (Followers: 10)
IETE Technical Review     Open Access   (Followers: 12)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 46)
Información Tecnológica     Open Access  
Innovation: Management, Policy & Practice     Hybrid Journal   (Followers: 16)
Innovation: The European Journal of Social Science Research     Hybrid Journal   (Followers: 10)
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 10)
Integrating Materials and Manufacturing Innovation     Open Access   (Followers: 6)
International Journal for Quality Research     Open Access   (Followers: 6)
International Journal for the History of Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Additive and Subtractive Materials Manufacturing     Hybrid Journal   (Followers: 8)
International Journal of Advanced Design and Manufacturing Technology     Open Access   (Followers: 7)
International Journal of Automation and Logistics     Hybrid Journal   (Followers: 5)
International Journal of Bifurcation and Chaos     Hybrid Journal   (Followers: 4)
International Journal of Business and Systems Research     Hybrid Journal   (Followers: 1)
International Journal of Concrete Technology     Full-text available via subscription  
International Journal of Design     Open Access   (Followers: 28)
International Journal of Design Creativity and Innovation     Hybrid Journal   (Followers: 3)
International Journal of Digital Enterprise Technology     Hybrid Journal   (Followers: 1)
International Journal of Embedded Systems and Emerging Technologies     Full-text available via subscription  
International Journal of Energy Technology and Policy     Hybrid Journal   (Followers: 7)
International Journal of Engineering and Manufacturing     Open Access   (Followers: 2)
International Journal of Engineering Materials and Manufacture     Open Access   (Followers: 2)
International Journal of Experimental Design and Process Optimisation     Hybrid Journal   (Followers: 7)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Technology Management     Hybrid Journal   (Followers: 10)
International Journal of Intelligent Transportation Systems Research     Hybrid Journal   (Followers: 14)
International Journal of Law and Information Technology     Hybrid Journal   (Followers: 6)
International Journal of Learning Technology     Hybrid Journal   (Followers: 9)
International Journal of Lightweight Materials and Manufacture     Open Access  
International Journal of Manufacturing Engineering     Open Access   (Followers: 2)
International Journal of Manufacturing, Materials, and Mechanical Engineering     Full-text available via subscription   (Followers: 18)
International journal of materials research     Full-text available via subscription   (Followers: 2)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 11)
International Journal of Nano and Biomaterials     Hybrid Journal   (Followers: 10)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 5)
International Journal of Planning and Scheduling     Hybrid Journal   (Followers: 3)
International Journal of Precision Engineering and Manufacturing-Green Technology     Hybrid Journal   (Followers: 2)
International Journal of Production Management and Engineering     Open Access   (Followers: 5)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 6)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 4)
International Journal of Service and Computing Oriented Manufacturing     Hybrid Journal   (Followers: 2)
International Journal of Social and Humanistic Computing     Hybrid Journal   (Followers: 1)
International Journal of System of Systems Engineering     Hybrid Journal   (Followers: 2)
International Journal of Technoentrepreneurship     Hybrid Journal   (Followers: 1)
International Journal of Technological Learning, Innovation and Development     Hybrid Journal   (Followers: 6)
International Journal of Technology and Design Education     Hybrid Journal   (Followers: 11)
International Journal of Technology and Globalisation     Hybrid Journal   (Followers: 3)
International Journal of Technology Intelligence and Planning     Hybrid Journal   (Followers: 1)
International Journal of Technology Management     Hybrid Journal   (Followers: 4)
International Journal of Technology Marketing     Hybrid Journal   (Followers: 6)
International Journal of Technology Transfer and Commercialisation     Hybrid Journal   (Followers: 1)
International Journal of Technology, Policy and Management     Hybrid Journal   (Followers: 1)
International Journal of Telecommunications & Emerging Technologies     Full-text available via subscription  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 7)
International Wood Products Journal     Hybrid Journal   (Followers: 3)
ITL - International Journal of Applied Linguistics     Full-text available via subscription   (Followers: 14)
Journal for Manufacturing Science and Production     Hybrid Journal   (Followers: 7)
Journal for New Generation Sciences     Open Access   (Followers: 4)
Journal of Analytical Science & Technology     Open Access   (Followers: 6)
Journal of Applied Sciences     Open Access   (Followers: 5)
Journal of Control & Instrumentation     Full-text available via subscription   (Followers: 18)
Journal of Design Research     Hybrid Journal   (Followers: 16)
Journal of Energy, Mechanical, Material and Manufacturing Engineering     Open Access   (Followers: 1)
Journal of Engineered Fibers and Fabrics     Open Access   (Followers: 2)
Journal of Engineering and Technology     Open Access   (Followers: 6)
Journal of Enterprise Transformation     Hybrid Journal   (Followers: 1)
Journal of Frugal Innovation     Open Access  
Journal of High Technology Management Research     Hybrid Journal   (Followers: 2)
Journal of Industrial and Production Engineering     Hybrid Journal   (Followers: 4)
Journal of large-scale research facilities JLSRF     Open Access  
Journal of Law, Information and Science     Full-text available via subscription   (Followers: 19)
Journal of Manufacturing and Materials Processing     Open Access  
Journal of Materials Science Research     Open Access   (Followers: 8)
Journal of Micro-Bio Robotics     Hybrid Journal   (Followers: 1)
Journal of Nanobiotechnology     Open Access   (Followers: 3)
Journal of Operations and Supply Chain Management     Open Access   (Followers: 9)
Journal of Production Research & Management     Full-text available via subscription   (Followers: 2)
Journal of Remanufacturing     Open Access   (Followers: 4)
Journal of Scientific and Industrial Research (JSIR)     Open Access   (Followers: 12)
Journal of Sensor Technology     Open Access   (Followers: 4)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 11)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Journal of Technological Possibilism     Open Access  
Journal of Technology in Human Services     Hybrid Journal   (Followers: 4)
Journal of Technology Management for Growing Economies     Open Access   (Followers: 3)
Journal of the Chinese Institute of Industrial Engineers     Hybrid Journal   (Followers: 1)
Journal of The Royal Society Interface     Full-text available via subscription   (Followers: 11)
Journal of Urban Technology     Hybrid Journal   (Followers: 5)
Jurnal Energi Dan Manufaktur     Open Access  
Lasers in Manufacturing and Materials Processing     Full-text available via subscription  
Leibniz Transactions on Embedded Systems     Open Access  
Lightweight Design     Hybrid Journal   (Followers: 6)
Main Science and Technology Indicators - Principaux indicateurs de la science et de la technologie     Full-text available via subscription  
Management and Production Engineering Review     Open Access   (Followers: 4)
Manufacturing Letters     Full-text available via subscription   (Followers: 2)
Manufacturing Review     Open Access   (Followers: 1)
Manufacturing Science and Technology     Open Access   (Followers: 3)
Materials Circular Economy     Hybrid Journal   (Followers: 4)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 22)
Materials testing. Materialprüfung     Full-text available via subscription   (Followers: 7)
MECCA Journal of Middle European Construction and Design of Cars     Open Access   (Followers: 2)
Mechanics of Soft Materials     Hybrid Journal  
Métodos y Materiales     Open Access   (Followers: 2)
Microgravity Science and Technology     Hybrid Journal   (Followers: 2)
Modern Electronic Materials     Open Access   (Followers: 1)
NanoEthics     Hybrid Journal   (Followers: 1)
Nanomanufacturing and Metrology     Hybrid Journal  
Nature Biotechnology     Full-text available via subscription   (Followers: 686)
NDT & E International     Hybrid Journal   (Followers: 185)
Nonconventional Technologies Review     Open Access   (Followers: 2)
Numismatické listy     Open Access  
Perspectives on Global Development and Technology     Hybrid Journal  
Plastics, Rubber and Composites     Hybrid Journal   (Followers: 9)
Procedia CIRP     Open Access   (Followers: 3)
Procedia IUTAM     Open Access  
Procedia Manufacturing     Open Access   (Followers: 1)
Production     Open Access  
Production & Manufacturing Research     Open Access   (Followers: 2)
Progress in Additive Manufacturing     Hybrid Journal   (Followers: 4)
Publikationsreihe des Manufacturing Excellence Netzwerks     Full-text available via subscription   (Followers: 1)
Reliability Engineering & System Safety     Hybrid Journal   (Followers: 23)
Remote Sensing Letters     Hybrid Journal   (Followers: 44)
Research Papers Faculty of Materials Science and Technology Slovak University of Technology     Open Access   (Followers: 3)
Revista de Ciências Exatas e Tecnologia     Open Access   (Followers: 1)
Revista Latinoamericana de Metalurgia y Materiales     Open Access  
Revista Produção Online     Open Access  
Science and Technology of Advanced Materials     Open Access   (Followers: 7)
Science China Materials     Hybrid Journal   (Followers: 1)
Scientia Canadensis: Canadian Journal of the History of Science, Technology and Medicine / Scientia Canadensis : revue canadienne d'histoire des sciences, des techniques et de la médecine     Open Access   (Followers: 6)
Strategic Design Research Journal     Open Access   (Followers: 2)
Structural Health Monitoring     Hybrid Journal   (Followers: 6)
Surveys in Operations Research and Management Science     Hybrid Journal   (Followers: 3)
Sustainability : The Journal of Record     Hybrid Journal   (Followers: 6)
Synthesis Lectures on Engineers, Technology and Society     Full-text available via subscription  
Synthesis Lectures on Image, Video, and Multimedia Processing     Full-text available via subscription   (Followers: 5)
Technical Communication Quarterly     Hybrid Journal   (Followers: 10)
Techniques et culture     Open Access   (Followers: 2)

        1 2     

Similar Journals
Journal Cover
Lasers in Manufacturing and Materials Processing
Journal Prestige (SJR): 0.311
Citation Impact (citeScore): 1
Number of Followers: 0  
 
  Full-text available via subscription Subscription journal
ISSN (Print) 2196-7229 - ISSN (Online) 2196-7237
Published by Springer-Verlag Homepage  [2626 journals]
  • Investigations on the Interplay Between Focusing and Absorption in
           Absorber-Free Laser Transmission Welding of Plastics
    • Abstract: Purpose Lab-on-a-chip devices, where small channels and reaction chambers have to be covered with a sealing lid, laser beam welding has already been proven to show considerable potential for standard material combinations. To avoid absorbing additives, the wavelength of the laser has to fit the absorption bands of the polymers. For it to achieve a localized weld seam, the laser beam has to be strongly focused. Methods To achieve the desired temperature distribution, we establish and discuss the heat rate generated by a focused beam as a function of the absorption coefficient and the Rayleigh length. Thermal simulation of the weld process reveals the dependence of the temperature on Rayleigh length and absorption coefficient. Experiments were carried out with a tunable laser source emitting between 700 and 1000 nm on polycarbonate samples doped with Lumogen 788 dye. Microtome cuts of the welded samples reveal the dimensions of the heat-affected zone and, therefore, of the seam. Results Experimental and simulation results show that for typical welding conditions a localized seam inside a sample can be achieved with an appropriate focusing of the laser beam and tuning of the wavelength. The dimensions of the heat-affected zone decrease as absorption coefficient decreases and welding velocity increases. The discussion of the functional dependence of the heat rate on absorption coefficient and Rayleigh length shows that Rayleigh length and sample thickness have to be smaller than the optical penetration depth.
      PubDate: 2019-03-08
       
  • Dissimilar Laser Welding of NiTi Wires
    • Abstract: Abstract NiTi shape memory alloys are well-known due to their outstanding functional properties including superelasticity (SE) and Shape Memory Effect (SME). Laser welding is a viable technique for the joining of NiTi wires, which are employed in the design of smart structures. Joining of dissimilar wires can provide better flexibility using various alloys and, consequently, lead to multi-functional properties. However, this is really challenging due to the effect of temperature on microstructure and composition of the welded joints, since the thermal process alters the material microstructure and subsequently the transformation temperature of the heat affected area. Therefore, it is of utmost relevance to find the optimal laser operational parameters for this process. In this context, this study investigates the dissimilar laser welding of NiTi wires. The experimental investigation is based on several interconnected analyses that include optical microscopy (OM), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS) analysis. Thermal analysis by Differential scanning calorimetry (DSC) is also performed to check the matching between the thermal transition of the welded joints compared to the reference materials. Highest energy delivered during welding led to welded joints of better quality. Lastly, the identification of the optimal operational parameters of the laser welding process, such as laser power and scan speed, was found to be crucial to preserve microstructural properties of the welded wires, thermal transition temperatures and therefore avoid to affect the functionality of the materials.
      PubDate: 2019-03-04
       
  • Femtosecond Laser-Induced Nonlinear Absorption in Thick Polystyrene
    • Abstract: Abstract The nonlinear absorption behavior of thick polystyrene sample was experimentally investigated and theoretically analyzed. As polystyrene is transparent to the applied laser wavelength, the absorption was mainly through nonlinear absorption by the bulk material. The effective second order nonlinear absorption coefficient (β) was determined with the z scan technique. The nonlinear behavior at different laser powers: 5.2 mW, 10.4 mW, 14.4 mW and 23.5 mW were investigated. The transmittance of laser energy was measured and a significant change was observed with different sample distance from the laser focal plane. By treating the thick polystyrene sample as a stack of thin layers, the effective nonlinear absorption coefficient was determined to be 0.000695 m/W with a standard deviation of 0.000026.
      PubDate: 2019-03-01
       
  • Application of the Pulsed Nd: YAG Laser Welding to Investigate the Effect
           of Laser Beam Position on Weld Characteristics of AISI 420 Stainless Steel
           to Kovar Alloy
    • Abstract: Abstract In the present study, dissimilar joining of AISI 420 Stainless Steel (SS 420) to Kovar alloy using a pulsed Nd:YAG laser welding was carried out. The effect of laser beam position with respect to the joint on the microstructure of dissimilar weldmetal was investigated through taking advantage of optical and scanning electron microscopy. Moreover, hardness measurement and fractography were performed to investigate the mechanical properties of weldmetal. A detailed effect of laser beam position on crack susceptibility of fusion zone is elaborated in this research work. The results showed promotion of susceptibility of fusion zone to cracking with offsetting laser beam position to SS 420 base metal. Also martensitic structure was formed in the weldmetal when off-set laser beam shifted 0.2 mm toward the SS 420 base metal. The microhardness test revealed that moving laser beam position toward SS 420 resulted in increasing weld hardness.
      PubDate: 2019-03-01
       
  • Laser Alloying of Surface of Ti-5.5Al-2Zr-1Mo-1 V Titanium near-α-Alloy
           Prepared Via Melted by Pulsed Laser Radiation TiC Particles
    • Abstract: Abstract Laser alloying of the surface of Ti-5.5Al-2Zr-1Mo-1 V titanium near-α-alloy was carried out in order to improve the surface properties. The surface of the titanium alloy was being melted by pulsed laser radiation while TiC alloying powder component was being supplied to the laser irradiation zone. As a result of laser alloying, partial melting of the powder particles of titanium carbide and mixing them with the substrate metal resulted in the formation of new disperse TiC phases in the form of dendrites and highly dispersed phases. It is shown that laser alloying of Ti-5.5Al-2Zr-1Mo-1 V titanium near-α-alloy by pulsed laser radiation leads to a 1.4 times increase in hardness of the surface of the titanium alloy and reduces friction coefficient 1.2 times.
      PubDate: 2019-03-01
       
  • Prediction and Control of Asymmetric Bead Shape in Laser-Arc Hybrid
           Fillet-Lap Joints in Sheet Metal Welds
    • Abstract: Abstract The shape and size of a weld bead - consisting of outer weld surface and inner fusion boundary - are important quality and strength attributes in sheet metal welds. The asymmetricity coupled with additional controlling parameters makes it challenging to predict the bead shape in laser-arc hybrid fillet-lap joints with use of lower order nonlinear analytical mathematical functions. An artificial neural network is designed to address the challenge, considering the welding speed, wire feed speed, voltage, current, and laser power as inputs. The experimentally obtained weld bead profiles are digitized in polar coordinates (r, θ) and thereby many input-output pairs are made available for training even with a limited number of experiments. An optimized neural network topology is presented with an assessment of reliability of simulation results. A rational approach for determining the number of coordinate points needed to accurately map the weld bead profile is an important contribution from the present investigation. The parametric study elucidates the effects of input parameters on geometry of the weld beads. The neural network exhibits the capability of capturing the process physics - demonstrated through the analysis of the weld dilution obtained from the simulation results. The welding speed and wire feed speed signifyingly affect the bead shape while the laser power has a minor impact. The laser, even though with less power, improves the weld dilution due to preheating of the base plate and stabilization of the welding arc.
      PubDate: 2019-03-01
       
  • Influence of the Real Geometry of the Laser Cut Front on the Absorbed
           Intensity and the Gas Flow
    • Abstract: Abstract The numerical investigations on experimentally determined cut front geometries presented in this paper show that the absorbed intensity reacts more sensitively to small local changes of the angle of the cut front than the gas velocity and the pressure. It is also found that the absorbed intensities near the top and the bottom of the cut front increase significantly when the initially regular process at high cutting speeds turns into the regime with interrupted striation patterns on the surface of the cutting edge.
      PubDate: 2019-03-01
       
  • Study on Effect of Laser Shock Peening as a Pre-Treatment on Fatigue
           Performance of Hard-Chorme Plated 15–5 PH Stainless Steel
    • PubDate: 2019-03-01
       
  • Effects of Composition and Post Heat Treatment on Shape Memory
           Characteristics and Mechanical Properties for Laser Direct Deposited
           Nitinol
    • Abstract: Abstract Nitinol structures were synthesized in a fully dense form using a laser direct deposition method. The pure elemental metal powders of nickel and titanium were used and powder ratios were controlled to arrive at the prescribed final chemical compositions of Nitinol. The transformation temperatures of synthesized Nitinol samples with different chemical composition and post heat treatment conditions were systematically analyzed and compared with those of conventional Nitinol. Compared to Nitinol parts produced by other techniques, the laser engineered net shaping (LENS) created the least amount of secondary phase, indicating the possibility of high corrosion resistance. Two step post processing of solution heat treatment and aging heat treatment was carried out to improve the homogeneity of the microstructure and to investigate its effects on phase transformation temperatures. The resultant phase transformation temperatures could be controlled by the heat treatment parameters. Compression test results showed mechanical properties of synthesized Nitinol samples are largely affected by its post heat treatment history while the effect of initial chemical composition was negligible.
      PubDate: 2019-03-01
       
  • Impact of Liquid Medium on Laser Ablation Mechanism: Surface Heating and
           Cooling
    • Abstract: Abstract Stainless steel target was ablated under both of Hexane and water to examine the effect of liquid on the ablation mechanism in terms of surface heating and cooling. Experimentally, a narrow, a smooth and a deep ablation is observed under water. In addition, the pit due to the collapse of cavitation bubble under water is insignificant as compared with Hexane. The focused beam on the target under liquid was estimated from measuring the crater’s diameter from the optical image. The difference in focused beam sizes is attributed mainly to the refractive index of the liquid. Heat transfer equation is solved to estimate the temperature profile on the solid surface for a single pulse. By considering the estimated beam size under liquid, the solution of heat transfer equation suggests for the first time rapid heating of the target under water, but doesn’t confirm the rapid cooling rate under Hexane. The smooth ablation in water is attributed to the more confined plasma.
      PubDate: 2018-12-01
       
  • Effect of Pulse Width in Pulsed Nd:YAG Dissimilar Laser Welding of
           Austenitic Stainless Steel (304 L) and Carbon Steel (st37)
    • Abstract: Abstract In the recent development of the automobile, power generation and petrochemical industries the application of dissimilar welds are gaining importance. In the present work, pulsed Nd:YAG laser welding of austenitic stainless steel (304 L) and carbon steel (st37) of 1.4 mm thickness for butt joint configuration have been investigated for automotive industries. The effect of pulsed width on weld bead width (top bead width (TBW) and bottom bead width (BBW), depth of penetration (DOP) and heat affected zone (HAZ) and fusion zone area have been studied. The microstructure characterization of the fusion zone, HAZ and base metals have been compared at varying pulse width using optical microscope. DOP decreases with increase in pulse width beyond 5 ms and fusion zone area decreases with increase in pulse width. Bottom weld bead width decreases with increase in pulse width and HAZ width of st37 side decreases with increase in pulse width. The mechanical properties such as microhardness and tensile strength of the welded joints at varying pulse width have been investigated. Ultimate tensile strength of all the welded joint at different pulse width was equal to the base metal st37 and fracture location was away from the fusion zone. The average microhardness of the fusion zone decreases with increase in pulse width due to the presence of martensite at low pulse width.
      PubDate: 2018-12-01
       
  • Material Characterisation with New Indentation Technique Based on
           Laser-Induced Shockwaves
    • Abstract: Abstract Conventional material development of new compositions is expensive and time consuming. Thus, for material characterisation there is a demand to enable high through-put experimentation to analyse and develop new materials in a short time. In this context, a new experimentation method is presented, which is based on TEA CO2 laser-induced shockwaves. First, plasma is created with a nanosecond pulsed TEA CO2 laser on top of a spherical indenter. Further interactions of the plasma with the high intensity laser beam result in a shockwave. The pressure of the shockwave is used to force the indenter penetrate inside the test material. Indentations are created on different aluminium alloys and correlated with hardness. The influence of environmental conditions, indenter material and diameter are investigated. Additionally, an energy model is introduced, which describes the possible indentation strain energy in dependence of the indenter diameter and the shockwave energy transferred to the indenter. The experiments reveal that smaller indenter diameters are recommendable for higher impact efficiencies. Best indentation results are achieved in terms of reproducibility and depth with a 3 mm indenter.
      PubDate: 2018-12-01
       
  • Recent Developments in Modeling of Laser Polishing of Metallic Materials
    • Abstract: Abstract Laser polishing (LP) represents one of the finishing/superfinishing technologies that has experienced a rapid growth over the past two decades. However, while undeniable progress has been achieved on the experimental and/or practical side, the development of the theoretical/numerical models of the continue to be somewhat slower and still dominated by significant simplifying assumptions. Along these lines, the main goal of the present study was to collate the most important modeling developments that were proposed so far in an attempt to synthesize the current stateof-art in the field. While the current consensus is that no single model could provide a comprehensive and accurate picture of the phenomena taking place during LP, it can be asserted at this time that reasonable matches between modeling and experimental results can be obtained under certain conditions. Furthermore, the complexity of the overlapping thermophysical processes that occur during laser polishing combined with the relatively limited database of functional dependencies between material properties and temperature and the impossibility to adequately monitor/measure in real-time many of the process parameters will continue to pose significant modeling and/or validation challenges. Moving forward, it could speculated that additional progress in the latter two categories will likely translate in more accurate representations of the intrinsic mechanisms underlying laser polishing.
      PubDate: 2018-12-01
       
  • Laser Beam Micro Drilling – a Review
    • Abstract: Abstract The recent advances in the manufacturing technology have led to the development of miniature products in the field of automobile, biomedical implants, biomedicine, aerospace and robotics. The literature is filled with work performed by researchers in the field of laser microdrilling. However, as of today, no exclusive review on the state of the art in laser micro drilling is reported. An attempt has been made to summarize the current state of understanding in laser micro drilling. The review begins with the classification of laser micro drilling and development of various modeling approaches. A variety of issues like identification of key process variables, selection of parameter ranges, selection of laser type and work piece combination and cause and effect diagram for various performance parameters are critically analyzed and presented. A statistical analysis of the contribution of various process parameters to the performance variable is reported. An insight into the laser micro drilling and future growth is presented in this article.
      PubDate: 2018-12-01
       
  • Overview of Laser Absorptivity Measurement Techniques for Material
           Processing
    • Abstract: Abstract During laser surface treatment, the beam absorption can vary considerably depending on the surface quality, temperature and environment. The metallic surfaces exhibit higher absorptivity when irradiated with a focused laser light. Investigation of the dynamic variation of absorptivity of metals during laser processing is a topic of interest for manufacturing community. This paper focuses on a brief review of absorptivity measurement methods adopted for industrial metals such as steel, titanium, aluminium and copper during laser surface treatment processes. It provides state of art in analytical, numerical and experimental techniques for measuring the absorptivity in order to design an efficient laser control systems.
      PubDate: 2018-12-01
       
  • A Microscale Study of Thermal Field and Stresses during Processing of
           Ti6Al4V Powder Layer by Selective Laser Melting
    • Abstract: Abstract Due to localized heating and cooling in the Selective Laser Melting based additive manufacturing process, a steep temperature gradient forms in the heat affected zone which induces unwanted thermal stresses in the component. In this work, a transient coupled thermo-mechanical model is developed to study the evolution of stresses at microscale on a spot during laser processing of Ti6Al4V powder layer in the heating and the subsequent cooling stage. The thermal model accounts for melting, solidification, fluid flow in the melt pool, variation of the material properties with different phases and volume reduction in the porous powder layer upon melting. The thermal model is validated by comparing the predicted melt pool size for different laser powers with the benchmark experimental data. The thermal model is fully coupled with the mechanical model, accounting plasticity, used to calculate the resulting stress field. The temporal evolution of temperature, various stress components and von Mises stress is described. During heating, compressive stresses are observed in the region below the melt pool. A zone of tensile stresses is developed in the surrounding region to balance these compressive stresses. During the cooling stage, tensile stresses are found in the solidified melt pool region and balancing compressive stresses are found in the region underneath. Determination of critical locations of excessive residual stress suggests that in the solidified melt pool and surrounding region in the solid substrate the residual stresses exceed the yield strength of the material. This implies yielding in that region which can cause material failure. It is quantified that the magnitude of residual stresses increases with laser power and laser interaction time and decreases with pre-heating of solid substrate.
      PubDate: 2018-12-01
       
  • Corrosion Study on Laser Shock Peened 316L Stainless Steel in Simulated
           Body Fluid and Chloride Medium
    • Abstract: Abstract In the present work, corrosion behavior of laser shock peened 316 L stainless steel was evaluated and compared with unpeened specimen in Hank solution (simulated body fluid) and chloride medium. Laser shock peening (LSP) was used for surface modification using Q-switched Nd-YAG laser. In the corrosion study, different electrochemical experiments such as open circuit potential (OCP)-time measurements, potentiodynamic anodic polarization, electrochemical impedance spectroscopy (EIS) measurements were performed in 0.5 M NaCl and Hank solution to examine the corrosion resistance of unpeened and laser peened 316 L SS specimens. The results of corrosion study demonstrated that LSP improved the pitting corrosion resistance despite marginally higher roughness (Ra = 1.01 μm) for laser peened surface than unpeened surface (Ra = 0.54 μm). Improvement in pitting corrosion resistance was indicated by ennoblement of OCP, more noble (anodic) value of pitting potential (Epit) and lower corrosion current density (Icorr). Conductivity and pH of NaCl and Hank solution increased after every polarization experiments which indicate the ionic dissolution during corrosion experiments. Qualitative analysis of Nyquist plots obtained from electrochemical impedance spectroscopy (EIS) results also showed higher arc radius (higher polarization resistance) for laser peened specimen than unpeened, which is indicative of more protective passive film and hence improved corrosion resistance. Further, microstructural examination after polarization experiments in both NaCl and Hank solution showed less pitting sites in laser peened specimens than unpeened surfaces. These microstructural observations are in line with the results obtained in polarization experiments. The results of the study are important with respect to medical implants and their biocompatibility in the human body.
      PubDate: 2018-09-01
       
  • Laser Folding in a Roll-to-Roll Manufacturing Process
    • Abstract: Abstract Origami-inspired design allows three dimensional systems to be made from two dimensional patterns typically far easier to create. We demonstrate a self-folding roll-to-roll process based on laser machining and folding. Using a low cost laser cutter, metal is cut, optically folded into 3D shapes and removed from an unpatterned roll of thin metal sheeting, all without manual handling. Folding is done through laser forming, localized laser heating to cause expansion and contraction for bending. Two different laser forming mechanisms, based on different temperature distributions within the workpiece, are characterized and demonstrated to allow both up and down bending using only the laser itself. These mechanisms are then used to prototype a series of parts using a roll-to-roll setup, with individual parts taken from a blank sheet of metal to a finished folded part in minutes. Our roll-to-roll laser origami approach is a major advance in production technology, allowing the use of a widely available 2D machine tool to create repeated custom 3D parts without human intervention.
      PubDate: 2018-09-01
       
  • Electromagnetic-Force-Assisted Bending and Straightening of AH36 Steel
           Strip by Laser Irradiation
    • Abstract: Abstract In this study, electromagnetic-force-assisted laser bending and straightening process is proposed, in which the external force is applied by a controlled force generated by an electromagnet. The process was found suitable for laser assisted bending and straightening. The experiments as well as simulations indicated that a large bend angle can be obtained by controlling the electric current and air gap between electromagnet and workpiece. A good agreement between simulation and experimental results was obtained. Edge effect was very less in case of strips that got attached with the magnet during laser bending. The spring-back effect was very less at high laser power, low scan speed and high current. The laser irradiated region had higher micro-hardness than base material. The micro-hardness of laser irradiated region depended on laser power, scan speed and magnetic force of attraction. Straightening of mechanically bent strip was also carried out. Results indicate that use of an electromagnet with laser irradiation is an effective way to straighten bent strips.
      PubDate: 2018-09-01
       
  • Microstructure and Wear Properties of Laser Treated Ni 3 Al Coatings on
           Low Alloy Medium Carbon Steel
    • Abstract: Abstract Laser modification of nickel-aluminide (Ni3Al) coatings on low alloy medium carbon steel substrate was carried out with the help of industrial CO2 laser. The depth of the laser melted zone (modified surface) was controlled as a function of input energy by varying the laser beam travel speed. The laser treated specimens were characterized for microstructure, chemical composition, and micro-hardness profile with respect to the laser penetration depth. Microstructural examination revealed that the laser treated surface was composed of ultrafine grain structure which evolved as a result of laser re-melting and solidification (cooling) rate used in this experiment. Microhardness results showed that as the depth of the laser melted zone increases the hardness of the modified surface decreases and vice versa. Further, the wear behavior of the laser treated surface was also studied with the help of ball-on-disc tribometer and by selecting 2000 m sliding distance. Wear test showed that as the depth of laser melted zone increases the wear of the surface increases as well and vice versa. The possible reason behind this phenomenon was the migration of iron (Fe) atoms from substrate into the surface layer which resulted the dissolution of Ni3Al coating particles in the surface layer and this was confirmed by the EDX analysis.
      PubDate: 2018-09-01
       
 
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