SHIELD GAS FOR MIG WELDING OF STAILESS STEEL AND METHOD FOR MIG WELDING

摘要

PROBLEM TO BE SOLVED: To provide a shield gas and a method for an MIG welding, by which an arc is stabilized, the end part of bead is stabilized, the wettability is excellent, and blowholes are not generated in the MIG welding of a stainless steel.;SOLUTION: As a shield gas used for the MIG welding of a thin plate of stainless steel in which a solid wire is used and a welding current is not larger than 100A, a mixture gas of three components is used which consists of 4 to 6 vol.% CO2, 30 to 80 vol.% He, and the balance Ar. As a shield gas used for the MIG welding of a plate of medium or large thickness of stainless steel in which a solid wire is used and a welding current is 100A or larger, a mixture gas of three components is used which consists of 4 to 6 vol.% CO2, 10 to 30 vol.% He, and the balance Ar. These gases are used in the method for the MIG welding of stainless steel.;COPYRIGHT: (C)2002,JPO