Cycles of triply coupled mechanical contact, current, and thermal conduction phenomena during resistance spot welding
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The characteristics of the cycles of coupled phenomena that occur among elastic-plastic contact deformation, current distribution, heat generation, and thermal conduction during resistance spot welding are examined using coupled finite element analyses. The current density peak that appears at the center of the interface moves outward along the interface to the high-contact resistance region, then the peaks in the current density, contact resistance, Joule heat generation, and temperature migrate outward with the contact edge followed by the melting zone during the welding process. The influence of welding parameters on the cycles of coupled phenomena is also examined. When the weld current is increased, the current density within the contact surface does not increase but enlarges the high-temperature region instead of heating the central part of the interface. When a small electrode force is applied, the nugget formation is initially enhanced not due to the increased contact resistance but rather because of the increase in the current density through the interface with a reduced contact area.
KeywordsResistance spot welding Cycles of coupled effects Contact resistance Nugget generation Welding parameters Triply coupled analysis
The authors wish to express their gratitude for cooperation of TOYOTA MOTOR KYUSHU Inc.
This work was supported by JSPS KAKENHI grant number 16K05043.
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