| 摘要 |
PURPOSE:To smooth remarkably a weld bead, by making shielding gas consisting of Ar, He and CO2 contain oxygen of a specified quantity, in case of positive polarity arc welding. CONSTITUTION:In case of gas shielded arc welding operation of positive polarity, in shielding gas consisting of one of Ar or He, or at least >=2 kinds among Ar, He and CO2, at least 5 volume % oxygen is contained. Or an electrode steel wire of 0.002-0.09wt% oxygen content is used, or both of them are used together. In this way, an attaching property of the deposited part becomes high remarkably, a contact angle of a bead cross section against a base metal is small, and a flat bead is obtained. |
