Welding material and arc welding method for low carbon martensitic stainless steel

摘要

A welding material has a composition containing 0.02 % by mass or less of carbon and nitrogen in total, 0.5% by mass or less of silicon, 0.2 to 3% by mass of manganese, 11 to 15% by mass of chromium, and 2 to 7% by mass of nickel, or further containing either or both of 2 % by mass or less of copper and 4% by mass or less of molybdenum; in arc welding of low carbon stainless steel materials which contain 0.05% by mass or less of carbon and 11 to 15% by mass of chromium, the welding material contains chromium, nickel, molybdenum, and copper in the following relationship: DF NUM="(1)"-0.5 ≤ X ≤ 5.0 /DF wherein X= (Crw-CrB) + (Niw-NiB)/2+ (Mow-MoB) + (Cuw-CuB)/4, to obtain a matching weld metal having high toughness and superior corrosion resistance; as for GMAW, direct current welding of straight polarity or alternating current welding can be employed in addition to direct current welding of negative polarity.