| 摘要 |
PURPOSE:To obtain a weld zone having low sensitivity to embrittlement by tempering by controlling the amt. of oxygen in a covering material and core wire to low level, incorporating a specific amt. of nitrogen therein and adjusting the C, Si, Mn, etc. to be supplied from the covering material and core wire into deposited metal by taking yield, etc. into consideration. CONSTITUTION:A covering material contg. <=0.2wt% iron oxide in terms of Fe is coated on the outside circumference of a core wire consisting of a Cr-Mo low alloy contg. <=0.01wt% oxygen. The alloy components expressed by formulas I - VIIIare incorporated into one or both of the core wire and covering material. In the formulas I -VIII, Bw; the coefft. of yield of each element incorporated in the core wire into deposited metal, Bf; the coefft. of yield of each element in the covering material into the deposited metal, Af; the weight ratio of the covering material with respect to the total weight of the welding rod, (element symbol %)w; the wt% of each element incorporated into the core wire, (element symbol %)f; the wt% of each element incorporated into the covering material. |
