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 paper, the first study on welding of Cu-based shape memory alloys was presented, where the superelastic wires used in the investigation had a nominal composition of Cu−17Al−11.4Mn (at%).
64 citations
TL;DR: In this article, a review on resistance spot welding of magnesium alloys is presented, with emphasis on the relationship between microstructure, properties, and performance, under quasi-static and dynamic loading conditions.
Abstract: This paper presents a review on resistance spot welding of magnesium alloys, with emphasis on the relationship between microstructure, properties, and performance, under quasi-static and dynamic loading conditions. It also compares the resistance spot welding of magnesium-to-aluminum alloys and the various techniques used to suppress the formation of brittle intermetallic compounds. Resistance spot welding of magnesium-to-steel, weld bonding, the effects of process parameters on joint quality, and the main metallurgical defects in resistance spot welding of magnesium alloys are also deliberated. Studies have shown that the pre-existence of coarse second phase particles in the base metal, the addition of particles, such as titanium powder, and welding under the influence of electromagnetic stirring effect can promote columnar-to-equiaxed transition, microstructure refinement, and improvement in mechanical properties of magnesium alloys resistance spot welds. For magnesium-to-aluminum alloys spot welds, the use of interlayers, such as pure nickel, gold-coated nickel foil, and zinc-coated steel, was found to suppress the formation of brittle intermetallic compounds and thus significantly improve the joint strength.
64 citations
TL;DR: Friction stir spot welding (FSSW) is a relatively recent development, which can provide a superior alternative to resistance spot welding and riveting for fabrication of aluminum sheet metal structures.
Abstract: Friction stir spot welding (FSSW) is a relatively recent development, which can provide a superior alternative to resistance spot welding and riveting for fabrication of aluminum sheet metal structures. In the current work, FSSW experiments were conducted in 3-mm thick sheets of aluminum alloy 2014 in T4 and T6 conditions, with and without Alclad layers. The effects of tool geometry and welding process parameters on joint formation were investigated. A good correlation between process parameters, bond width, hook height, joint strength, and fracture mode was observed. The presence of Alclad layers and the base metal temper condition were found to have no major effect on joint formation and joint strength. Friction stir spot welds produced under optimum conditions were found to be superior to riveted joints in lap-shear and cross-tension tests. The prospects of FSSW in aluminum sheet metal fabrication are discussed.
64 citations
TL;DR: In this article, the characteristics of electrode degradation in resistance spot welding of aluminium and its influence on weld quality were investigated based on analysis of electrode life test results, in which three parameters were defined to represent the tip surface characteristics, namely, relative radius, edge concentration and eccentricity.
Abstract: A study was carried out of the characteristics of electrode degradation in resistance spot welding of aluminium, and its influence on weld quality. Based on analysis of electrode life test results, an imaging approach was developed to determine quantitatively the status of electrode degradation, in which three parameters were defined to represent the tip surface characteristics, namely, relative radius, edge concentration, and eccentricity. This image analysis revealed a clear relationship between these defined electrode surface features and the weld quality, based on which a reasonable understanding was achieved of the causes of weld quality deterioration in electrode life tests. STWJ/404
64 citations
TL;DR: Particle concentrations and elemental concentrations were compared with allowable concentrations as recommended by the Occupational Safety and Health Administration and the American Conference of Governmental Industrial Hygienists and in all cases, workplace levels were at least 11 times lower than recommended levels.
Abstract: Airborne particles were characterized from six welding operations in three automotive plants, including resistance spot welding, metal inert gas (MIG) welding and tungsten inert gas (TIG) welding of aluminum and resistance spot welding, MIG welding and weld-through sealer of galvanized steel. Particle levels were measured throughout the process area to select a sampling location, followed by intensive particle sampling over one working shift. Temporal trends were measured, and particles were collected on filters to characterize their size and chemistry. In all cases, the particles fell into a bimodal size distribution with very large particles >20 μm in diameter, possibly emitted as spatter or metal expulsions, and very small particles about 1 μm in diameter, possibly formed from condensation of vaporized metal. The mass median aerodynamic diameter was about 1 μm, with only about 7% of the particle mass present as ultrafine particles <100 nm. About half the mass of aluminum welding particles could be acco...
64 citations