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Manual clamping, the motor drives the cam to upsetting and butt welding, then annealing manually. 手動(dòng)固定夾緊，電機(jī)帶動(dòng)多組凸輪進(jìn)行頂鍛對(duì)焊，然后再進(jìn)行手動(dòng)二次退火處理。