本発明は、正極性期間と逆極性期間とを交互に繰り返して溶接を行う交流TIG溶接方法であって、溶接中にTIG電極と溶接対象物との接触を検出し、TIG電極と溶接対象物とが接触している場合には一方の極性期間から他方の極性期間への転流を禁止することで、極性反転時のスイッチングにより発生するサージ電圧が発生しないことから、半導体素子が破損することを防ぐことができる。
The present invention provides an alternating current TIG welding method of performing welding by alternate repetition of a straight polarity period and a reverse polarity period, by which it is possible to prevent a semiconductor element from being damaged because a surge voltage caused by a switching at the time of a polarity inversion is not generated by detecting a contact of a TIG electrode with an object to be welded during welding and, in the case where the TIG electrode is in contact with the object to be welded, inhibiting commutation from one polarity period to the other polarity period.patents-wipo patents-wipo