RESISTANCE SPOT WELDING SYSTEM USING DYNAMIC RESISTANCE CHARACTERISTICS FOR WELD QUALITY IMPROVEMENT AND METHOD OF POWER SUPPLY FOR RESISTANCE SPOT WELDING MACHINE

摘要

According to the present invention, to obtain a more stable welding quality, power for welding is supplied to a current carrying a front half portion of which contact resistance before a dynamic resistance critical point is greatly changed with constant-voltage control or constant power control. Moreover, in a current carrying a rear half portion of which contact resistance after the dynamic resistance critical point is relatively and constantly changed, an optimal welding state is able to be obtained with constant-current control from external effects.;COPYRIGHT KIPO 2017