| 摘要 |
PURPOSE:To prevent the solidification cracking by welding thoroughly even if a steel material contg. a specific amt. of C is welded at a high speed in the stage of gas shielded arc welding of said material at the specific welding speed or above by contg. Ni in a filler for a compsoite wire at a specific weight ratio with the wire or above. CONSTITUTION:A stee material contg. 0.005-0.06% C is subjected to gas shielded welding at >=40cm/min welding speed. An Ni-contg. composite wire is used in this case and the content of Ni to be contained in the filler of said wire is specified so as to satisfy the equation in the ratio of Ni (w) based on the weight of the wire. In the equation, C(p); the content % of carbon in the steel material, C(t); the content % of carbon in the sheath of the wire, C(w); the content % of carbon in the filler based on the weight of the wire. At least the 1st layer is welded by using such wire. |
