Patent ID: 6552293
Filing Date: 2003-04-22
Classification: B23K,H01R

Abstract:
A metallic members joining method in which a pair of electrodes are pressed against metallic members while simultaneously an AC waveform current flows through said pair of electrodes, said metallic members being joined together by making use of Joule heat generated in said metallic members, said method comprising:converting an AC voltage of a commercial frequency by a rectifying circuit into a DC voltage; converting said DC voltage output from said rectifying circuit by an inverter into a pulsed voltage of a high frequency; applying said high-frequency pulsed voltage output from said inverter across a transformer and via said pair of electrodes to said metallic members without rectification on a secondary side of said transformer; segmenting a current-supplying time for a single joining into a plurality of unit current-supplying periods and switching said inverter at said high frequency so as to allow an AC waveform current having a set current value to flow through the secondary side of said transformer with one polarity in each odd-numbered unit current-supplying period but with the other polarity in each even-numbered unit current-supplying period; when predetermined phenomena or predetermined conditions to halt a regular supply of current occur or are satisfied during said current-supplying time, bringing switching operations of said inverter to a halt to interrupt the regular supply of current; and providing a switching control of said inverter so as to allow an electric current for erasing residual magnetism to flow through the secondary side of said transformer depending on the elapsed time and polarity in said unit current-supplying period upon said halt of supply of current.