FLUX-CORED WIRE FOR TWO ELECTRODE ELECTRO GAS ARC WELDING AND TWO ELECTRODE ELECTRO GAS ARC WELDING METHOD

摘要

1 to form a pair of welding plate surface side blood is improved when a large width than the side (beveling) the butt, and fixedly, movably installed and from the welding wire with respect to the direction of the welding wire improved depth. Each average value of the content in the composition of C in an amount of welding wire: 0.02 to 0.09%, Mn: 1.5 to 2.5%, Si: 0.2 to 0.6%, Ni: 0.6 to 1.9%, Mo: 0.3 to 1.2%, Ti: 0.10 to 0.40%, B: 0.005 to 0.020%, Mg: 0.10 and to 0.50%, and the total amount of Ni + Mo 1.2 to 2.6% by mass of Mo and Ni Mo / Ni is 0.25 to 1.00, the balance being Fe and unavoidable impurities and the slag is produced. By performing the second electrode electro gas arc welding method In this way, the heat input is high and the strength and toughness of the weld metal in excess of 500kJ / cm, excellent Chengdu welding operation.