Patent ID: 8283599

Claim:
A welding method for T-joint in which a lower plate and an upright plate disposed in a T-shape are welded, comprising: a plate assembling step of assembling said upright plate to said lower plate in a T-shape in a state in which a gap is formed between a lower end portion of said upright plate and a top surface of said lower plate; a first welding step of generating an arc from a welding electrode disposed on a front surface of said upright plate in a state in which said lower plate and said upright plate are assembled in the T-shape in said plate assembling step, so as to form a penetration bead on said lower plate while fusing said welding electrode and said lower plate and causing said gap to remain between a back surface of said upright plate and said lower plate; and a second welding step of generating an arc from said welding electrode disposed on said front surface side of said upright plate after said first welding step, to form a welding bead by fusing said welding electrode, said lower plate, said lower end portion of said upright plate, and said penetration bead, thereby joining said lower plate and said lower end portion of said upright plate.