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 weld interface is modeled as rough metallic surfaces in sliding contact, and a junction growth model is used to identify parameter sets for ultrasonic spot welding and ultrasonic additive manufacturing that maximize the weld strength while simultaneously minimizing the thermal excursion at the weld interfaces.
35 citations
Journal Article•
TL;DR: In this paper, the authors investigated the influence of stiffness, friction, and moving mass on the welding process and weld quality of resistance spot welding machines and found that machine stiffness and friction did not significantly affect the quality of welding processes.
Abstract: Mechanical characteristics of resistance spot welding machines, such as stiffness, friction, and moving mass, have complex influences on the resistance welding process and weld quality. In this paper, these influences are systematically investigated through experiments. The mechanisms of the influences are explored by analyzing process signatures, such as welding force and electrode displacement, and other process characteristics, such as electrode alignment. A better understanding of the influences is achieved through this analysis. This study shows machine stiffness and friction affect welding processes and weld quality. It also confirms the moving mass does not significantly affect the process and quality of resistance spot welding.
35 citations
TL;DR: In this paper, a three-dimensional thermo-elasto-plastic contact model of counterformal bodies is presented, which takes into account transient heat flux, temperature-dependent strain hardening behavior, and a realistic heat partition between surfaces.
Abstract: Sliding electrical contacts are found in many electromechanical devices, such as relays, switches, and resistance spot welding. Temperature rise due to sliding friction and electrical current may be the major source of sliding electrical contact deterioration. This paper reports the development of a three-dimensional thermo-elasto-plastic contact model of counterformal bodies, which takes into account transient heat flux, temperature-dependent strain hardening behavior, and a realistic heat partition between surfaces. Transient contact simulations induce a significant increase in computational burden. The discrete convolution and fast Fourier transform and the conjugate gradient method are utilized to improve the computation efficiency. The present model is used to study the case of a half-space sliding over a stationary sphere, and both are made of 7075 aluminum alloy; the contact resistance is considered mainly due to the surface oxide film. The simulation results indicate that the transient contact model is able to capture the history of plastic deformation accumulation and the material melting inception.
35 citations
TL;DR: In this article, a weld-bonding hybrid process is carried out to join Mg alloy and Al alloy, and the technology combines a modified metal inert gas (MIG) spot welding process with adhesive bonding.
35 citations
TL;DR: In this paper, rare-earth containing ZEK100 magnesium alloy sheets were joined using friction stir spot welding and overlap joints were created under various tool rotational rate and shoulder plunge depths.
35 citations