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试验发现,直流电阻对焊时产生变形的起始时刻处在通电期间及断电时刻.如为断电时刻,变形较小;如在通电期间则变形较大.焊接过程中,焊接电流和工件两端电压发生有规律的动态变化,变化规律与变形和温度有关.本文对此进行了分析,并提出要保证一定的变形程度,可以采用位移(即工件的缩短量)控制通电时间,从而实现保证足够热输入的设想.
The test found that DC resistance butt welding deformation of the starting moment in the power-on period and the power moment, such as the power moment, the deformation is small; such as the deformation during the power is larger. Welding process, the welding current and the workpiece The voltage at both ends of the voltage has a regular dynamic change, and the variation is related to the deformation and temperature.This paper analyzes this and proposes to ensure a certain degree of deformation, and the displacement (that is, the shortening of the workpiece) can be used to control the energization time to achieve Enough assumptions to ensure heat input.