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Spot welding

About: Spot welding is a research topic. Over the lifetime, 12491 publications have been published within this topic receiving 89845 citations. The topic is also known as: Spot_welding.


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Journal ArticleDOI
TL;DR: In this article, the authors investigated the resistance spot welding (RSW) parameters for an uncoated mild steel sample and two hot-dip galvanized steel samples with different zinc layer thicknesses.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the role of interaction conditions at the tool-workpiece interface is emphasized and a simplified conceptual mechanism for effects of process variables on the physical phenomena is presented, with the help of a basic platform in the form of a physical-based, coupled, thermo-mechanical model.
Abstract: Friction Stir Spot Welding (FSSW) is a variant of the Friction Stir Welding (FSW) process and has been successfully used in industrial applications. During the FSSW process, thermal inputs due to friction and deformation are commenced simultaneously, as the non-consumable rotating tool plunges into the workpiece to be welded. Various assumptions and hypotheses for mechanisms of heat generation and material deformation during FSW/FSSW process are reported, but a consensus is still to be reached. The joining quality is mainly dependent upon the material flow in this solid state joining technique. The material flow and deformations in the near and far fields of the weld are directly affected by the temperature-sensitive mechanical properties. Therefore, a comprehension of thermo-mechanical responses are of high importance from the viewpoints of parameter optimization and understanding of the mechanisms. The FSSW process is experimentally and theoretically studied to address these issues of the mechanism of heat generation and coupled thermo-mechanical response of the workpiece, as well as the effects of tool rotation and plunge speeds. For theoretical studies, a 3-dimensional, physical-based FEM (Finite Element Method) model is developed using commercial code. For heat generation, friction and deformation-based formulations are used. For material responses, thermal and strain rate-sensitive, elastic-plastic data are employed by a constitutive Johnson Cook material model and thermo-mechanical behaviour is analyzed with respect to experimental observations. To cope with high calculation time and distortion of the mesh, built-in features of the code, mass scaling, ALE (Arbitrary Lagrangian Eulerian) and mesh re-mapping were used. As a result of this work, a basic platform in the form of a physical-based, coupled, thermo-mechanical model is developed. With the help of this model, effects of process parameters on the temperature — displacement behaviour of the workpiece are studied. The role of interaction conditions at the tool-workpiece interface is emphasized and a simplified conceptual mechanism for effects of process variables on the physical phenomena is presented.

29 citations

Journal ArticleDOI
Jun Shen1, Y. Li1, T. Zhang1, D. Peng1, Dan Wang1, Nan Xu1 
TL;DR: In this article, the influence of different lap configurations and preheating process on the macro-/microstructures and mechanical properties of friction stir spot welding welds with both similar and dissimilar materials (6061-T6 aluminium alloy and AZ31B magnesium alloy) was investigated.
Abstract: The influence of different lap configurations and preheating process on the macro-/microstructures and mechanical properties of friction stir spot welding welds with both similar and dissimilar materials (6061-T6 aluminium alloy and AZ31B magnesium alloy) was investigated. The results showed that the different lap configurations resulted in different macro-/microstructures and mechanical properties of welds. Defect free welds and intermetallic compound containing welds were obtained in configurations of similar (Mg/Mg and Al/Al) and dissimilar (Mg/Al and Al/Mg) respectively. The welds with similar materials had the highest tensile shear strengths, followed by the Mg/Al welds; the Al/Mg welds had the lowest strength. The preheating process improved the tensile shear strengths of Mg/Mg, Al/Al and Mg/Al welds and reduced that of Al/Mg welds respectively.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of weld-bonded joints has been evaluated by tensile shear and fatigue tests on dual-phase steel sheets of 1·0 mm.
Abstract: Lap joints of dual phase steel sheets of 1·0 mm were prepared by adhesive bonding, spot welding and weld bonding processes using a one component epoxy base structural adhesive. Mechanical properties of the joints were evaluated by tensile shear and fatigue tests. The size of the weld nugget for both spot weld and weld bond was measured for different welding parameters (current, time) and compared. For identical welding parameters, weld bonded nuggets exhibit higher nugget diameter. Tensile shear strength of weld bonded joints is 40 and 58% higher than spot welded joints and 15 and 39% higher than adhesive bonded joints and for DP590 and DP780 steels respectively. Considering 106 cycles, the endurance limit of weld bonded joint is much higher than spot welded joint but smaller than adhesive bonded joints. Overall the performance of weld bonded joints is superior to those of resistance spot welding.

29 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of the coating composition and the welding parameters on the heat generation and nugget formation during resistance spot welding of the hot press forming steels have been evaluated.
Abstract: In this work, the effects of the coating composition and the welding parameters on the heat generation and nugget formation during resistance spot welding of the hot press forming steels have been evaluated. Two types of coated steels were used, termed as Al–Si and Zn coating. Al–Si coated steel showed rapid nugget growth toward the electrode direction, which is the probable reason of the higher heat conduction from the electrode–sheet surface toward the bulk material. In Zn coated steel, heat was generated and localised at the faying interface and uniformly propagated to the steel substrate. High speed camera images showed that the presence of oxide at faying interface provides inhomogeneous current flow and violent heat generation in the Zn coated steel.

29 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023208
2022415
2021355
2020620
2019739
2018744