Topic
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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TL;DR: In this article, the fatigue strength of dissimilar welds was evaluated based on the effective nugget size, defined as the area where Al or Mg alloy remained on the steel side after static fracture.
Abstract: Aluminium alloy A6061-T6 or magnesium alloy AZ31 sheet was welded to steel sheet by a friction stir spot welding technique using a scroll grooved tool without a probe. The material flow in the nugget of the Mg/steel weld was less than that in the Al/steel one. The Al/steel weld exhibited higher static tensile–shear strength than the Al/Al weld, while the strengths of Mg/steel and Mg/Mg welds were comparable. Tensile–shear fatigue tests were performed using lap shear specimens of both dissimilar and similar welds. The dissimilar welds exhibited nearly the same fatigue strengths as the similar ones. The effective nugget size in the dissimilar welds was defined as the area where Al or Mg alloy remained on the steel side after static fracture. When the fatigue strengths of dissimilar welds were evaluated based on the effective nugget size, the normalised fatigue strengths of Al/steel and Mg/steel welds were comparable.
45 citations
Journal Article•
TL;DR: In this article, spot weldability of dissimilar metal joints between stainless steels and nonstainless steels was investigated, and the failure load of the cross-tension specimens was around 72-78% of that of the lap shear specimens.
Abstract: Spot weldability of dissimilar metal joints between stainless steels and nonstainless steels was investigated. The aim was to determine the spot welding parameters for the dissimilar metal joints and to characterize the mechanical properties of the joints. Metallographical investigations, microhardness measurements, peel tests, lap shear tests, cross-tension tests, corrosion fatigue tests, and stress corrosion cracking tests were performed. It was found that in the dissimilar metal joints between stainless steel and nonstainless steel, the failure load of the cross-tension specimens was around 72-78% of that of the lap shear specimens. The weld nugget of the dissimilar metal joints was fully martensitic, but it was ductile enough so that the failure type was plug failure in both lap shear and cross-tension tests. In the case of the corrosion fatigue testing of the spot welded joints, different strength levels of the base materials did not have an effect on the corrosion fatigue strength, but the sheet thickness had a significant effect. The fatigue strength of a spot welded specimen increased with the increasing sheet thickness. Electro-coating of the test specimens did not have an effect on the corrosion fatigue properties of the spot welded joints. Stress corrosion cracking tests showed that the stainless steel EN 1.4318 and zinc-coated nonstainless steel ZStE260BH dissimilar metal joints are susceptible to hydrogen embrittlement in 3.5% sodium chloride solution at room temperature. Comparable cracking was also observed in the stainless-stainless steel joints, when they were galvanically coupled to zinc. The reason for hydrogen embrittlement of the dissimilar metal welds is that the weld nugget is fully martensitic and the corrosion potential is low due to the zinc plating.
45 citations
Patent•
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22 Nov 1933
TL;DR: In this paper, the present invention relates to metal structural elements, and more particularly to sheet metal beam or column structure particularly adapted to fabrication by spot welding, although the parts are well adapted to being secured by riveting or other suitable forms of attachment.
Abstract: The present invention relates to metal structural elements, and more particularly to sheet metal beam or column structure particularly adapted to fabrication by spot welding, although the parts are well adapted to being secured by riveting or other suitable forms of attachment. The invention...
45 citations
TL;DR: In this article, the authors investigated the resistance spot welding characteristics of martensitic steel (M130) having the thickness of 2 mm, utilising metallographic observation, microhardness and tensile-shear testing.
Abstract: Safety, emissions and fuel economy of vehicles have always been of great importance to automakers. Advanced high strength steels (AHSSs) have proved to be effective in fulfilling these needs of the industry, and this has led to great opportunities for increasing usage of AHSSs. The present work aimed to investigate the resistance spot welding characteristics of martensitic steel (M130) having the thickness of 2 mm, utilising metallographic observation, microhardness and tensile–shear testing. The results were compared for different combinations of martensitic steel and low carbon steel (LCS). In the study of interfacial to pull-out failure mode transition, dissimilar M130/LCS welds exhibited the lowest tendency to fail in the interfacial failure mode. Weld nugget diameter is proposed as a main variable controlling the peak load and energy absorption of the welds along with other factors such as electrode indentation and hardness/strength of the failure location.
45 citations
TL;DR: In this article, the behavior of thin welds of different grades of steels in dynamic loading conditions such as those experienced in automotive crash test is investigated. And the evaluation of resistance to dynamic failure will be studied through impact tensile test (ITT).
45 citations