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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32 citations
TL;DR: In this paper, the role of alloying elements such as silicon (Si) on microstructure details and RSW parameters, both of which influence LME cracking is studied.
32 citations
Patent•
01 Dec 1967
TL;DR: In this paper, a unitized body having a front-end assembly 12, a rear end assembly 14, a roof assembly 16 and floor pan 18 is assembled by placing the rear assembly over a welding back-up buck, positioning the other assemblies about the buck by means of their internal attachment flanges, removing the buck and subsequently spot welding the floor assembly 18 into position.
Abstract: 1,201,580. Vehicle bodies. BUDD CO. 29 Nov., 1968 [1 Dec., 1967], No. 56848/68. Heading B7B. A unitized body having a front-end assembly 12, a rear end assembly 14, a roof assembly 16 and floor pan 18 is assembled by placing the rear assembly over a welding back-up buck, positioning the other assemblies about the buck by means of their internal attachment flanges, spot welding said flanges, removing the buck and subsequently spot welding the floor assembly 18 into position by means of its internal attachment flanges.
31 citations
TL;DR: In this paper, a modified version of friction stir spot welding (FSSW) is applied to join Al5083 specimens, which leads to better characteristics, finer grain sizes in the stir zone and higher mechanical properties.
Abstract: In this study, a modified version of friction stir spot welding (FSSW) is applied to join Al5083 specimens. In respect to conventional FSSW, this new method leads to better characteristics, finer grain sizes in the stir zone and higher mechanical properties. In this method, the workpiece is vibrated normal to tool axis direction during FSSW. This process is entitled friction stir spot vibration welding (FSSVW). The finite element method (FEM) was used to validate the experimental results. The FEM and experimental results had a good agreement. The microstructure of the welded zone was analyzed by scanning electron microscopy and optical microscopy. The results showed that the presence of vibration during FSSW led to more grain refinement. This was related to more straining of material in the welded zone which enhanced the dynamic recovery and recrystallization and increased the grain refinement. The results showed that grain size of welded region for friction stir spot-welded specimen was about 35% lower than that for friction stir spot-welded specimen. Mechanical properties such as tensile shear load and hardness increased as the vibration was applied. Also, mechanical properties increased as vibration frequency increased from 28 to 38 Hz during FSSVW.
31 citations
01 Dec 1986-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this article, material variations and process modifications have been studied to determine their effects on the acceptable range of resistance spot welding conditions for galvanized steel sheet, and it was found that hot-dipped galvanized materials with coatings which have a very thin Fe-Zn alloy layer have a wider range of acceptable welding conditions than the commercial galvannealed products, which had a fully alloyed FeZn coating.
Abstract: Material variations and process modifications have been studied to determine their effects on the acceptable range of resistance spot welding conditions for galvanized steel sheet. The material variations studied include zinc coating integrity, structure, composition, thickness, roughness, oil, and the amount and type of Fe-Zn intermetallics. Process modifications studied include upsloping and downsloping of the weld current, preheat current, postheat current, electrode tip geometry, and applied force. It was found that hot-dipped galvanized materials with coatings which have a very thin Fe-Zn alloy layer have a wider range of acceptable welding conditions than the commercial galvannealed products, which have a fully alloyed Fe-Zn coating. The decreased lobe width of the galvannealed material is due to the discontinuous Fe-Zn coating structure and morphology. Small variations in the thickness of the coatings studied have no significant effect on the welding current range. Surface roughness of the coating has no effect on lobe width. Upsloping and downsloping of the weld current increase the welding range of hot-dipped products when using truncated cone electrodes, whereas sloped current has no advantage for galvannealed or uncoated materials. Radiused electrodes can increase the lobe width of hot-dipped products but are not beneficial when using sloped current or when welding galvannealed or uncoated materials.
31 citations