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, the impact velocity of the welding points of Al-Fe heterologous pipe fittings was studied by combining numerical simulation and technological test with the assistance of constitutive relations of 3A21Al alloy under a high strain rate.
56 citations
TL;DR: In this paper, microstructure and mechanical properties of the dissimilar aluminium-magnesium resistance spot welds made with gold coated and bare nickel interlayers are investigated; the welds were made with different welding currents in a range from 16 to 24 kA with a fixed welding time of five cycles.
Abstract: Microstructure and mechanical properties of the dissimilar aluminium–magnesium resistance spot welds made with gold coated and bare nickel interlayers are investigated. Welds were made with different welding currents in a range from 16 to 24 kA with a fixed welding time of five cycles. No joints were achieved with a bare nickel interlayer; after welding, specimens were separated without applying any force. Addition of gold coating on nickel surface greatly contributed to the metallurgical bonding at the interfaces and welds easily met requirements of AWS D17·2 standard. Average lap shear strength reached 90% of similar AZ-31B spot weld strength. Fusion nugget size, interfacial microstructure and fracture surface morphology of the welds were analysed.
56 citations
TL;DR: In this paper, the effect of process variables and energy input on joint formation between Al-6111 and Mg-AZ31 alloys was investigated and the optimum welding conditions, heat generation, and the formation of a significant intermetallic reaction layer were reported.
Abstract: The ability to join dissimilar materials in the automotive industry will result in more efficient multimaterial structures. However, welding of aluminium (Al) to magnesium (Mg) alloys is problematic because of the rapid formation of brittle intermetallic phases at the weld interface. Ultrasonic welding (USW) is a solid-state joining technology that may offer a potential solution, but USW of Al to Mg is currently not well understood. Here, we have investigated the effect of process variables and energy input on joint formation between Al-6111 and Mg-AZ31 alloys, and we report on the optimum welding conditions, heat generation, and the formation of a significant intermetallic reaction layer. Furthermore, the factors influencing the interface reaction rate and the advantages of precoating the Mg with Al are discussed.
56 citations
TL;DR: In this article, the authors summarized the current understanding of the bonding mechanism and the structure in various similar and dissimilar metal pairs joined by magnetic pulse welding (MPW) and proposed two major ideas based on either solid state bonding or local melting and solidification.
Abstract: Magnetic pulse welding (MPW) is a solid-state impact welding technology that provides metallurgical joints while exhibiting a negligible heat-affected zone. The MPW process is a high speed single shot welding technique used mainly for joining tubular components in a lap configuration and characteristic length scales of few millimeters to centimeters. It is similar in operation to explosive welding and shares the same physical principles. The nature of bonding in MPW is not sufficiently understood yet and some controversial explanations are reported in the literature. The two major ideas are based on either solid state bonding or local melting and solidification. The present work summarizes our current understanding of the bonding mechanism and the structure in various similar and dissimilar metal pairs joined by MPW.
56 citations
TL;DR: In this article, the microstructure, mechanical properties and electrical conductivity of the T2 copper joint achieved under high welding speed were tested and it was shown that the tensile strength and elongation of the joint are approximately 20% and 84% below those of the base material, respectively.
56 citations