Patent ID: 7026576

Claim:
A welding method comprising the steps of: providing a stainless steel welding wire comprising C, Si, Mn, Cr, N, Al, Ti, O and Fe, wherein C is present in an amount of greater than zero and up to and including 0.025 mass %, Si is present in an amount of greater than zero and up to and including 1.3 mass %, Mn is present in an amount of greater than zero and up to and including 2.0 mass %, Cr is present in an amount of 10 to 25 mass %, N is present in an amount of 0.047 to 0.2 mass %, Al and Ti are present in amounts in mass % satisfying a relationship (1) below e −800( x −0.05) 2 multiplied by e −300( y −0.08) 2 ≧0.5 (1) wherein x and y represent contents in mass % of Al and Ti, respectively, O is present in an amount in mass % satisfying a relationship (2) below z <( x+y −0.01)/0.5 (2) wherein z represents a total amount in mass % of oxygen in the welding wire, and x and y represent the Al and Ti contents, respectively, defined in the relationship (1), and the balance being Fe and unavoidable impurities; preparing a shielding gas containing Ar and at least one of O 2 and CO 2 , provided that the volume % of the O 2 and CO 2 contained in the shielding gas are p and q, respectively, wherein p and q do not simultaneously have a value of zero, the shielding gas satisfies relationships p≦10 and q≦50 and a relationship (3) below p+q ≦( x+y −0.01−0.5 z )/0.0006 (3) wherein x and y represent the Al and Ti contents, respectively, defined in the relationship (1), and z represents the total amount of O defined in the relationship (2); and performing a gas-shielded welding while supplying the shielding gas to a region around the welding wires, wherein during the welding method, AlN and TiN are formed in a welded portion.