WELDING WIRE AND WELDING METHOD FOR PREHEATING TEMPERATURE DECREASING HIGH TENSILE STEEL

摘要

PURPOSE: To provide a welding wire and welding method by which defectless weld metal can be obtained by suppressing preheating to be executed prior to welding at a temp. lower than the temp. at which the preheating is executed heretofore in the case of using of a wire having the equiv. strength in welding to be applied to high-strength steel products. ;CONSTITUTION: This welding wire contains 0.03 to 0.1% C, 0.3 to 1.0% Si, 0.9 to 2.5& Mn, 0.1 to 0.6% Mo and 0.05 to 0.5% Cu and one or two kinds of 0.05 to 0.20% V and 0.01 to 0.3% Nb. Further, 0.3 to 2.5% Ni, 0.1 to 0.5% Cr, 0.05 to 0.35% Ti and 0.0005 to 0.0080% B are incorporated therein. Welding working efficiency and working environment are improved by using this wire.;COPYRIGHT: (C)1995,JPO