SUBMERGED ARC WELDING METHOD FOR CR-MO LOW ALLOY STEEL

摘要

PURPOSE:To improve the weld strength by using a wire containing specific amounts of Cr and Mo and baked flux containing CaF2 and metallic carbonate and further, adding specific components to one side or both sides of the wire or the flux. CONSTITUTION:The wire containing 1.80-3.80% Cr and 0.80-1.30% Mo and not containing Ti and Nb substantially and the baked flux containing 10-20% CaF2 and the metallic carbonate equivalent to 2.5-10% CO2 and not containing Ti, a Ti oxide, Nb, and an Nb oxide substantially are used and further, C, Si, Mn, V (or V2O5) and B (or B2O3) are added to either one side or both sides of the wire or the flux so as to satisfy formulas and the welding is performed. By this method, the satisfactory weld strength can be obtained.