Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access   (Followers: 2)
Advanced Device Materials     Open Access   (Followers: 6)
American Journal of Fluid Dynamics     Open Access   (Followers: 44)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 4)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 21)
Complex Metals     Open Access   (Followers: 2)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 24)
Graphene and 2D Materials     Open Access   (Followers: 6)
Handbook of Ferromagnetic Materials     Full-text available via subscription   (Followers: 1)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
High Temperature Materials and Processes     Open Access   (Followers: 6)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 11)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 1)
International Journal of Metals     Open Access   (Followers: 7)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 11)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 4)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 26)
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)     Full-text available via subscription   (Followers: 2)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 35)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Heavy Metal Toxicity and Diseases     Open Access  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 11)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 2)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 21)
Journal of Metallurgical Engineering     Open Access   (Followers: 4)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 6)
Metal Finishing     Full-text available via subscription   (Followers: 20)
Metallurgical and Materials Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 32)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 8)
Metallurgy and Foundry Engineering     Open Access   (Followers: 2)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 36)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 8)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Practical Metallography     Full-text available via subscription   (Followers: 6)
Rare Metals     Hybrid Journal   (Followers: 3)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access   (Followers: 1)
Revue de Métallurgie     Full-text available via subscription  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 7)
Steel Times lnternational     Partially Free   (Followers: 19)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 5)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 3)
Welding in the World     Hybrid Journal   (Followers: 7)
Welding International     Hybrid Journal   (Followers: 11)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Welding in the World
Journal Prestige (SJR): 0.533
Citation Impact (citeScore): 2
Number of Followers: 7  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0043-2288 - ISSN (Online) 1878-6669
Published by Springer-Verlag Homepage  [2626 journals]
  • The analysis of the fracture mechanism of thermal simulation CGHAZ of AHSS
           DP780: based on response surface method and quantum genetic algorithm
    • Abstract: Abstract AHSS is widely used in the automobile industry due to its lightweight and high strength. However, the larger carbon equivalent results in poor weldability and causes a severe performance decrease in the performance of the CGHAZ. The thermal simulation was utilized to analyze the fracture mechanism of the CGHAZ of DP780 high-strength steel, and the microstructure and mechanical properties of the CGHAZ were studied by combining the response surface method (RSM) and the quantum genetic algorithm (QGA). Results showed that the predominant fracture type of CGHAZ was a brittle fracture. Meanwhile, the analysis combining energy dispersive spectrometer (EDS) and metallographic showed that the precipitation of carbides, the increase of the content of upper bainite (UB), and the coarse grains were the main reasons for brittle fracture. When the peak temperature, heating rate, and cooling rate were 1100 °C, 60 °C/min, and 1300 °C/min, respectively, the maximum impact energy of CGHAZ was 7.83 J. The results of optimization combining RSM and QGA showed that the impact energy of CGHAZ was increased by 0.7%, and the error between the results of verification and optimization was 1.93%. Therefore, it has positive significance for reducing the brittleness of CGHAZ by adopting lower heat input and slower cooling rate.
      PubDate: 2021-01-13
  • The effect of flame straightening on the microstructure and mechanical
           properties of different strength steels
    • Abstract: Abstract In many cases, flame straightening is unavoidable after welding for the reduction of deformation. Due to the not very concentrated heat source, the process can cause significant changes in the microstructure, especially in high strength and wear-resistant steels. Due to their different physical properties, the effects vary depending on the flammable gases (acetylene, propane). The situation is complicated by the fact that the manual technology carries a risk of overheating, which can have detrimental effects on the mechanical properties. During our experiments, three steels are investigated (S355J2 + N, XAR400, S960QL). The thermal cycles for the physical simulations were determined by thermocouple measurement during real experimental conditions. Three peak temperatures (1000 °C, 800 °C and 675 °C) and two types of industrial cooling conditions (air and water cooling) were studied. The samples were examined by optical microscopy tests, hardness testing and Charpy V-notch impact tests. During straightening the XAR400 showed high sensitivity to softening even in the lower temperature range, while hardening occurred in the S960QL steel at a higher peak temperature values during water cooling. The inter- and supercritical temperature should be avoided in all steels; however, the subcritical temperature can be beneficial to the toughness properties of the S960QL and XAR400.
      PubDate: 2021-01-13
  • The suppression of solidification cracking of Al welds by regulating Zn/Mg
    • Abstract: Abstract 7xxx series aluminum alloys are susceptible to solidification cracking during fusion welding. This study systematically investigates the solidification cracking susceptibility of T-Mg32(AlZn)49-strengthened Cu-free Al-Mg-Zn alloy with a Zn/Mg ratio below 1.0. The alloy is different from η-MgZn2-strengthened 7xxx series alloys whose Zn/Mg ratios are above 1.0. The crack length of the studied Al-Mg-Zn series alloys is shorter than traditional Cu-free 7xxx series alloys, which corresponds to lower solidification cracking tendency. Welding cracks tend to grow along the continuous eutectic phases during the end of welding solidification, and thus, cracks occur when liquid can no longer hold the constraining stress. According to the results, Al-Mg-Zn series alloys have the narrower eutectic temperature range and narrower mushy zone than 7xxx series alloys. Thus, the constraining stress during solidification is lower than 7xxx series alloys. The liquid fractions of the Al-Mg-Zn series alloys are relatively high than 7xxx series alloys, making it possible to heal micro-cracks during the end of solidification process.
      PubDate: 2021-01-11
  • A review of current LME test methods and suggestions for developing a
           standardized test procedure
    • Abstract: Abstract To improve automotive fuel economy, automobile manufacturers are minimizing the weight of the body-in-white. To do this, they are adopting new 3rd generation advanced high strength steels that have excellent strength and ductility. However, these steels are also prone to liquid metal embrittlement (LME) cracking; intergranular cracks caused by molten zinc, from the galvanized coating, penetrating the steel substrate during the resistance spot welding (RSW) process. These cracks are not acceptable to automobile manufacturers as it is unknown how LME cracks affect joint strength during weld service. To decrease LME cracking, extensive research into understanding its governing metallurgy, optimizing welding parameters, and comparing the LME sensitivity of multiple grades has been done. Most of this work was done using hot-tension testing or RSW testing. However, as there is no standard methodology for these tests, producing results that were difficult to compare. This review examined test methodologies for hot-tension and RSW testing LME severity. It was determined that the usefulness of LME testing could be improved if test methods reflected the temperature and stress-state of the welding process, facilitated comparisons between tests, and quantified results were reported. Recommendations are provided to improve hot-tension and RSW tests to meet these goals.
      PubDate: 2021-01-11
  • Mechanism and optimization of activating fluxes for process stability and
           weldability of hybrid laser-arc welded HSLA steel
    • Abstract: Abstract The effects of activating fluxes on weld bead morphology, arc behavior, electrical signals, and temperature field were investigated. Real-time weld pool dynamics, electrical signal waveforms, and temperature contours were obtained by high speed camera, real-time electric signal acquisition card, and infrared thermal camera. The additions of SiO2, TiO2, ZnO, and Fe2O3 not only improved the weld formation and penetration depth but also reduced the welding voltage and increased welding current. Decomposition and evaporation of activating fluxes produced oxygen caused arc constriction and increased the laser efficiency. The effect of MnO2 was little. CaO and B2O3 dramatically deteriorated process stability since CaO and B2O3 gave rise to droplet transfer mode changing from spray transfer to short-circuit/ large globular repelled transfer.
      PubDate: 2021-01-07
  • EBSD study of dissimilar transient liquid phase joining of duplex
           stainless steel SAF 2205 to nickel-based superalloy IN X-750
    • Abstract: Abstract SAF 2205 and IN X-750 were joined using the TLP method. The joining process was carried out at 1100 °C for different times using BNi-3 interlayer. Microstructural study and identification of the present phases in the bonding regions were performed using optical microscopy and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy and electron backscatter diffraction technique. Microhardness and shear strength tests were done to measure the mechanical properties. Different phases such as BN, Ni3B, Ni2B, CrB, Cr2B, and Ni2Si were formed in the bonding area. EBSD analysis results showed that the amount of the formed phases in the bonding area is a function of the bonding time. As the holding time increased, the amount of created phases in the bonding area increased from about 8 to 11 wt.%. The microhardness profile of the joining area also behaved differently as the bonding time changed. The maximum measured microhardness was about 850 HV which appeared in the athermally solidified zone of the bonded sample for 1 min. The maximum shear strength was observed in the bonded sample with complete isothermal solidification, approximately 72% of the shear strength of SAF 2205 and 85% of IN X-750.
      PubDate: 2021-01-07
  • A non-destructive resonant acoustic testing and defect classification of
           additively manufactured lattice structures
    • Abstract: Abstract Additive manufacturing enables the fabrication of lattice structures which are of particular interest to fabricate medical implants and lightweight aerospace parts. Product integrity is critical in these applications. This requests very challenging quality control for such complex geometries, particularly on detecting internal defects. It is important not only to detect whether there are missing struts for a product with a large size of lattices, but also to identify the number of missing struts for safety-critical applications. Resonant ultrasound spectroscopy is a promising method for fast and cost-effective non-destructive testing of complex geometries but data analytics methods are needed to systematically analyze resonant ultrasound signals for defect identification and classification. This study utilizes resonant acoustic method to obtain resonant frequency spectrum of test lattice structures. In addition, regularized linear discriminant analysis, combined with adaptive sampling and normalization, is developed to classify the number of missing struts. The result shows 80.95% testing accuracy on validation study, which suggests that the resonant acoustic method combined with machine learning is a powerful tool to inspect lattices.
      PubDate: 2021-01-07
  • Correction to: Shear strength/microstructure relationship for dissimilar
           IN738/IN718 TLP joints
    • Abstract: The original version of this article unfortunately contained a mistake.
      PubDate: 2021-01-06
  • Investigation of tool offset on mechanical properties of dissimilar
           AA6061-T6 and AA7075-T6 joint in parallel FSW process
    • Abstract: Abstract This paper presents a new two-pass friction stir welding (FSW) implementation called parallel friction stir welding (P-FSW). This process is classified into two categories: Advanced parallel friction stir welding (AP-FSW) and retreating parallel friction stir welding (RP-FSW). The effects of three parameters named the type of process, tool offset in first pass, and tool offset in the second pass on tensile strength of AA6061-T6 and AA7075-T6 joint in FSW have been investigated experimentally. To design experiments, optimization, and analyzing the results, response surface methodology (RSM) has been used. Quantitative and qualitative variables have been considered in five and two levels, respectively. Based on obtained results, it has been observed that tool offset in the second pass, type of process, and tool offset in the first pass have the most effect on tensile strength of welded joint, respectively. In both AP-FSW and RP-FSW processes, the maximum tensile strength occurred at the maximum value of tool offset in the second pass and minimum value of tool offset in the first pass. The maximum joint efficiency of AP-FSW and RP-FSW processes with respect to AA6061-T6 were obtained 83.1% and 95.4%, respectively.
      PubDate: 2021-01-06
  • Morphology and texture characterization of grains in laser welding of
           aluminum alloys
    • Abstract: Abstract Grain morphology and texture of welds significantly affect the properties of the corresponding joint. It is very important to determine how heat and grain growth during welding correlate. Our studies involved both experiments and multi-scale numerical modeling. The laser welding temperature distribution was studied by the macroscopic finite element method. The grain growth and morphology evolution under different heat input conditions were calculated by the Monte Carlo method at the mesoscale. The relationship between heat flow distribution and grain orientation was established. Results of electron backscattered diffraction (EBSD) were compared to those obtained by numerical modeling. The welding heat input affected the heat flow distribution and the shape of the molten pool, which, in turn, influenced grain morphology and crystal orientation.
      PubDate: 2021-01-06
  • Influence of focus and deflection when comparing electron beam welds to
           laser welds at varying parameters in 304 SS
    • Abstract: Abstract In many cases, both laser and electron beam welding may be considered for critical applications involving a wide range of structural materials. The ability to use both processes to make comparable welds in terms of both weld profile (penetration) and microstructure provides considerable process selection flexibility. In this study, autogenous, partial penetration welds on 304 and 304L SS were made using both fiber laser and electron beam processes. To simplify the analysis, many parameters were kept constant between processes, including working distance and spot size. The main variables, power and travel speed, were varied individually. Beam analysis was conducted using a PRIMES Focus Monitor to characterize the laser beam and a pro-beam diagnostic tool (PBD) for the electron beam. Electron beam welds were deflected or defocused to achieve a spot size similar to that of the laser welds, approximately 500 μm. The deflection pattern chosen for electron beam welding was made to mimic the power distribution of the laser. A similar melting efficiency at varying powers and travel speeds was maintained for both processes. Geometries and microstructures of the deflected and defocused electron beam welds and the laser beam welds are compared and related to process parameters.
      PubDate: 2021-01-06
  • Influence of droplet transfer behaviour on the microstructure, mechanical
           properties and corrosion resistance of wire arc additively manufactured
           Inconel (IN) 625 components
    • Abstract: Abstract A Ni-based superalloy, Inconel 625, is widely used for aerospace, petrochemical and marine applications due to its excellent corrosion and elevated temperature mechanical properties. In this study, efforts were made to identify optimum deposition parameters to produce directionally solidified Inconel 625 components using wire arc additive manufacturing (WAAM). Components were deposited by short-circuiting and short-circuiting with pulse mode of droplet transfers using a commercial cold metal transfer gas metal arc welding (CMT-GMAW) power source. For a given arc energy, metal droplet transfer behaviour was studied using a high-speed camera. Microstructural analysis and corrosion resistance of Inconel 625 samples produced by WAAM and samples made by conventional casting process were compared by advanced characterisation methods. Inconel 625 samples produced using a combination of short-circuiting with pulsing free flight transfers showed improved mechanical properties than as-cast samples and samples made only by short-circuiting transfer due to the formation of directionally solidified coarse-grained columnar microstructure. Moreover, corrosion resistance of WAAM samples was found to better than that of as-cast samples. Based on the results, an optimised current-voltage waveform and droplet transfer modes were identified to produce defect-free Inconel 625 deposits with desired microstructure, and mechanical and corrosion-resistance properties.
      PubDate: 2021-01-05
  • Formability and mechanical property of refill friction stir
           spot–welded joints
    • Abstract: Abstract The effects of rotation speed and plunge depth on macro/microstructures and mechanical properties of dissimilar 2195/2219 aluminum alloy joints produced by refill friction stir spot welding (RFSSW) were investigated. The results show that some shallow annular grooves present on the joint surfaces depending on the process parameters. Besides, hook defects are in the form of downward bending due to the higher strength of 2195 aluminum alloy. The change of rotating speed has no apparent influence on hook defect, while the increase of plunge depth makes the height of the hook defect increase significantly. The higher tensile-shear strength is associated with increased rotation speed. However, as the plunge depth increases, the tensile-shear strength rises first and then decreases. The highest tensile-shear strength measured is 6480 N, for a rotation speed of 1600 rpm, and plunge depth of 2.5 mm. Besides, there are two kinds of fracture modes present: the plug fracture and the shear-plug fracture.
      PubDate: 2021-01-04
  • Joining of C f /SiC composite with Cu–Pd–V filler alloy and Mo
    • Abstract: Abstract Cf/SiC composites were joined to itself with (and without) Mo interlayer at 1150 °C for 10 min by Cu–Pd–V filler metal. For two kinds of the joints, after the interfacial reactions, continuous V–C layers and dispersive V–C particles were formed at surface of the joined Cf/SiC composite. It was worth noting that much more dispersive particles were formed in case of Cf/SiC–Mo–Cf/SiC joint which was favorable to the Cf/SiC joint strength. Meanwhile, when adding a Mo interlayer in Cf/SiC joint, a continuously distributed (V, Mo)–Si compounds with high melting point was formed near the Mo interface, which can strengthen the joining interface and improve the high-temperature strength. As a consequence, the joint strength at room temperature was remarkably increased to 148.9 MPa from 99.3 MPa by inserting the Mo interlayer. When tested at 800 °C, the average three-point bend strength of the joints was improved to 120.1 MPa, nearly twice of that without Mo interlayer.
      PubDate: 2021-01-03
  • An experimental design of spot welding of Ti6Al4V sheets and numerical
           modeling approach
    • Abstract: Abstract In this study, the traditional α–β titanium alloy Ti6Al4V sheets were joined by the resistance spot welding (RSW) process. RSW method was modeled numerically and investigated experimentally by using different welding parameters. In numerical modeling, material properties and process parameters were modeled with the finite element method (FEM), and simulations were realized in experimentally performed parameters. In order to validate and calibrate the developed numerical model, preliminary experiments were carried out and then Taguchi L9 orthogonal experimental design was determined to examine the effect of different parameters that are thought to be suitable for this process. The signal/noise (S/N) ratio was used to interpret the results in the determined experimental setup. The experimental study aims to validate the established numerical model and to obtain information such as the unpredictable strength of the welded joint through the numerical model. The experimental results were analyzed by using the Taguchi technique with the help of the Minitab software. In this study, electrode force, welding current, and welding time parameters were determined as the control factors, and the effect of these factors on the results was found using analysis of variance (ANOVA). Lastly, verification tests were performed, and it was determined that optimization was applied successfully.
      PubDate: 2021-01-02
  • Modelling and measurements of gas tungsten arc welding in argon–helium
           mixtures with metal vapour
    • Abstract: Abstract Argon–helium mixtures in gas tungsten arc welding of an iron workpiece are investigated using an axisymmetric computational model that includes the cathode, workpiece, and arc plasma in the computational domain. The three-gas combined diffusion coefficient method is used to treat diffusion of helium, argon, and iron vapour. Calculations for argon–helium mixtures without metal vapour are performed; good agreement with previous numerical results is found. A transition from a helium-like to an argon-like arc occurs when the argon mole fraction increases above about 0.3. Calculations for a wide range of argon–helium mixtures including iron vapour are then performed. Adding helium to argon alters the arc properties and affects the weld geometry. Iron vapour cools the arc for all argon–helium mixtures. Iron vapour is present above the workpiece, near the cathode and in the arc fringes for very low argon mole fractions. As the argon mole fraction increases, the iron vapour becomes increasingly confined to the region above the workpiece, with small amounts near the cathode tip. Emission spectroscopy measurements of arcs in argon–helium mixtures with water-cooled copper and uncooled iron workpieces were performed. The measured distributions of atomic helium and iron emission show good agreement with the predictions of the model.
      PubDate: 2021-01-02
  • Experimental investigation on improving the deposition rate of gas metal
           arc-based additive manufacturing by auxiliary wire feeding method
    • Abstract: Abstract Traditional gas metal arc-based additive manufacturing (GMA-AM), also referred to as wire arc additive manufacture (WAAM), improves deposition rate via increasing deposition current, but it is easy to affect the shape-forming and microstructure of the deposited part due to the increased heat input. To avoid such problems, a novel auxiliary wire feeding GMA-AM (A-GMA-AM) approach is proposed to achieve high deposition rate at low deposition current. This paper investigates the effects of A-GMA-AM when the deposition current ranges from 100 to 180 A. The process window was explored, and the influence of the feeding speed of auxiliary wire on the bead geometries and the heat-affected zone area was analyzed. It was observed that the increase in the feeding speed of the auxiliary wire can increase the bead height and remain the bead width unchanged. When the feeding speed of the auxiliary wire reaches the upper limit at the corresponding deposition current, the deposition rate of A-GMA-AM is at least 1.65 times than that of traditional GMA-AM at the same deposition current, and the heat-affected zone area is reduced by at least 28.6%. The results showed that the A-GMA-AM method is more efficient in increasing deposition rate and reducing the heat in AM components.
      PubDate: 2021-01-01
  • Development of shielded metal arc welding electrodes to achieve
           carbide-free bainitic weld microstructures
    • Abstract: Abstract Carbide-free bainite (CFB) microstructures containing a mixture of nano-sized retained austenite laths and bainitic ferrite exhibit a good combination of strength, ductility, and toughness. In this work, an attempt was made to identify welding electrode compositions with a carbon content of about 0.35 to 0.5 wt.% to achieve carbide-free bainite microstructures in multi-pass shielded metal arc welds. Suitable alloy compositions were designed using a commercial neural network–based database, considering thermodynamic parameters such as allotropic phase boundary (XTo), ΔGɣ-ɑ (driving force for transformation) and martensite start temperatures. Three different alloy compositions were identified using this approach. Shielded metal arc welding (SMAW) electrodes were fabricated with the compositions identified and the samples extracted from the weld deposits were used for dilatometer studies, metallurgical characterisation, and mechanical property evaluation. Based on the results, an optimised electrode composition and welding parameters were identified to stabilise the carbide-free bainitic microstructures in weld metal.
      PubDate: 2021-01-01
  • Toughness properties at multi-layer laser beam welding of high-strength
    • Abstract: Abstract The material characteristics of high toughness and high strength in steel are usually not available at the same time. However, it would be an advantage if high-strength steels would show high impact toughness also at lower temperatures for applications in critical surroundings. In this paper, an approach of multi-layer welding of high-strength steel is presented in order to increase the weld-metal toughness using wire material in combination with thermal cycle modifications. Promising interlocking microstructures were found after multiple tempering of the previously applied structure at homogeneously distributed material in the weld seam. It was found that short thermal cycles during laser processing lead to insufficient time for carbon diffusion, which leads to remaining ferrite structures in contrast to the prediction of welding transformation diagrams. The additionally applied heating cycles during multi-layer laser welding induce the formation of interlocking microstructures that help to increase the weld seam toughness.
      PubDate: 2021-01-01
  • A new approach to improve the ductility of non-penetrating laser-welded
           lap joints of cold-rolled 301LN stainless steel
    • Abstract: Abstract The aim of this work is to improve the fracture ductility of non-penetrating laser-welded lap joints. The 1.5 + 2.0 and 2.0 + 2.0 lap plates of cold-rolled 301LN stainless steel tilted 15° in the load direction and in the reverse load direction were welded by a vertical laser beam to prepare a positive-tilt weld (PTW) and negative-tilt weld (NTW). The tilt weld had a regular geometry, and the solidification centerline was tilted by approximately 15°. The laser-welded 301LN stainless steel was solidified by the primary ferritic mode with good resistance to thermal cracking, and the weld metal with ultrafine grains had excellent plasticity. The main weld in the penetrating plate of the NTW joints has a greater bending moment than that of PTW joints under tensile loading conditions, so the plastic deformation of the NTW is due to uniform bending, while that of the PTW is due to approximate parallel stretching. The bending deformation of the main weld of the NTW joint leads to a greater tensile stress ratio (decomposed normal stress to shear stress) in the interfacial weld metal than that of the PTW joint, so the interfacial fracture ductility of NTW joints is much greater than that of PTW joints.
      PubDate: 2021-01-01
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