| 摘要 |
PURPOSE:To form a weld metal having excellent crack resistance even in the case of welding a groove formed of steel sheets under oscillation by specifying the content of C in a sheath metal and specifying the contents of C, Mn, etc., by the total weight of a welding rod. CONSTITUTION:This cored wire for non-shielded arc welding contains <0.04% C in the heath metal 3 and contains <=0.05% C, 1.0-4.0% Mn, <=0.2% Al, and <=0.005% S by the total weight of the welding rod. Welding is thereby executed without generating weld cracks even under the fluctuating stresses which are generated by vehicle traffic on a bridge and fluctuate the opening rate of the groove. |
