Topic
Electric resistance welding
About: Electric resistance welding is a research topic. Over the lifetime, 16761 publications have been published within this topic receiving 154851 citations.
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TL;DR: In this article, critical cooling rates for martensite formation were calculated for a range of automotive steels using available thermodynamically based phase transformation models, and these were then used to define combinations of process type, steel type, and gauge where welds could be formed avoiding martensites in the weld area microstructure.
Abstract: Weld strength, formability, and impact resistance for joints on automotive steels are dependent on the underlying microstructure. A martensitic weld area is often a precursor to reduced mechanical performance. In this paper, efforts are made to predict underlying joint microstructures for a range of processing approaches, steel types, and gauges. This was done first by calculating cooling rates for some typical automotive processes [resistance spot welding (RSW), resistance mash seam welding (RMSEW), laser beam welding (LBW), and gas metal arc welding (GMAW)]. Then, critical cooling rates for martensite formation were calculated for a range of automotive steels using available thermodynamically based phase transformation models. These were then used to define combinations of process type, steel type, and gauge where welds could be formed avoiding martensite in the weld area microstructure.
89 citations
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TL;DR: In this paper, an experimental investigation of resistance welding of carbon fiber fabric reinforced polyetherimide composites (CF fabric/PEI) was conducted on a welding area of 25 mm × 12 mm, and the quality of the welded specimens was studied using a non-destructive evaluation technique (C-scan) as well as a mechanical test (lap shear strength).
Abstract: This paper presents an experimental investigation of resistance welding of carbon fibre fabric reinforced polyetherimide composites (CF fabric/PEI). The heating elements were made from a single CF fabric/PEI prepreg sheet with neat PEI films co-moulded to both surfaces. Welding was conducted on a welding area of 25 mm × 12 mm. The quality of the welded specimens was studied using a non-destructive evaluation technique (C-scan) as well as a mechanical test (lap shear strength). The relationships between input power, input energy, welding time and consolidation pressure were studied. Experimental results indicated that sufficient joining was obtained at a power level from 80 to 160 kW/m2, under an initial welding pressure of 0.15 to 0.40 MPa. The maximum lap shear strength achieved through resistance welding was equivalent to that of the compression moulded benchmark. The fracture surfaces of welded specimens showed mostly cohesive-failure or intralaminar failure. An optimum processing window is proposed for the resistance welding of CF fabric/PEI composite system.
89 citations
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TL;DR: In this article, the effect of welding current on the quality of weld joint and obviously on tensile shear and tensile-peel strengths of galvanized chromate steel sheets having 1.2mm thickness in electrical resistance spot welding was investigated.
89 citations
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TL;DR: In this article, the influence of the dimensions of the laser beam spot on weld strength has also been analyzed and the weld process has been characterised by the specific energy required for each thickness, kind of plastic and the resistance of the weld seam.
89 citations
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TL;DR: In this article, an extensive investigation of the correlation between die design and the extrusion process of AA6082 aluminum alloy is presented, where a profile with a central seam weld line suitable for mechanical testing is extruded under different processing conditions, by varying the dimensions of the die feeder, the length of the welding chamber, the billet preheating temperature and the process speed.
88 citations