交流弧机焊防电击安全使用愈来愈引起国内外焊接工作者的关注.苏联和日本都已制定出相应的防电击焊机标准,我国自80年代初开始逐步开展对防电击焊机的研究.纵观国内外现状,绝大部分防电击焊机都采用强力接触器切断电源.虽然文献[1,2]披露过无触点防电击交流弧焊机的电气原理图,但因控制线路过于复杂而难以获得实际应用,或因仍然藉助中 AC arc welding machine anti-shock safety use more and more attracted the attention of domestic and foreign welding workers.Supply and Japan have developed a corresponding anti-shock welder standard, our country since the early 80s began to carry out the study of anti-shock welder . Looking at the status quo at home and abroad, most of the anti-shock welder are used to cut off the power contactor Although the literature [1,2] discloses the electrical diagram of the non-contact anti-shock AC arc welder, but the control line is too Complex and difficult to obtain practical application, or because of still using