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Introduction

Spot machine Department used duplex double points had flow welding of principle, work shí two electrode pressurized artifacts makes two layer metal in two electrode of pressure xià formed must of contact resistance, and welding current from a electrode flows through another a electrode shí in two contact resistance points formed moments of hot melt received, and welding current moments from another a electrode along two artifacts flow now electrode formed loop, not hurt and the was welder pieces of internal structure.