Cycles of triply coupled mechanical contact, current, and thermal conduction phenomena during resistance spot welding
Cycles of triply coupled mechanical contact, current, and thermal conduction phenomena during resistance spot welding
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DOI：
10.1007/s40194-018-00699-5
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发表时间：
2019-05-01
影响因子：
2.1
通讯作者：
Ishihara, Daisuke
中科院分区：
文献类型：
--
作者：
Horie, Tomoyoshi;Niho, Tomoya;Ishihara, Daisuke
采用耦合有限元分析方法，研究了电阻点焊过程中弹塑性接触变形、电流分布、生热和热传导之间的耦合现象的周期特性。出现在界面中心的电流密度峰值沿着界面向外移动到高接触电阻区域，然后在焊接过程中，电流密度、接触电阻、焦耳热生成和温度中的峰值随着接触边缘向外移动，然后是熔化区。还研究了焊接参数对耦合现象周期的影响。当焊接电流增加时，接触面内的电流密度并没有增加，而是扩大了高温区，而不是加热界面的中心部分。当施加小的电极力时，熔核形成最初不是由于增加的接触电阻而是由于通过具有减小的接触面积的界面的电流密度的增加而增强。
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.