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内部电阻

内部电阻的图片

In the context of resistance spot welding, the bulk resistance of a workpiece is a function of temperature.  All metals exhibit a Positive Temperature Coefficient (PTC), which means that their bulk resistance increases with temperature. Bulk resistance is a factor in longer welds.  Combined with contact resistance, the bulk resistance value of the workpieces, electrodes, and their interfaces both cause and affect the amount of heat generated. 

右上方的图显示了三个接触电阻值及四个内部电阻值,这些数值结合使用可确定所生产的热量。

如需了解更多信息,请阅读我们的 《电阻焊基本原理》