| 摘要 |
PURPOSE:To enable welding without causing weld crack at all when parts of a bridge, etc., receiving repeated varying stress are welded, by using a specified wire for welding. CONSTITUTION:A wire having a chemical compsn. consisting of, by weight, 0.005-0.05% C, <=0.25% Si, 1.00-2.70% Mn, <=0.015% P, <=0.004% S (Mn/S>=350) and the balance essentially Fe is used. Since the ratio of Mn to S is >=350, most of S in the resulting weld metal is deposited in the form of MnS as a high m.p. inclusion and the reduction of the ductility at high temp. is avoided. Accordingly, weld crack can be prevented during welding under varying stresses. |
