| 摘要 |
PROBLEM TO BE SOLVED: To provide a nearly T shape fillet welded joint which is formed by the gas shield arc welding method suitable for the fillet welded joint of a steel floor plate of a bridge and a rib material to be used to reinforce the steel floor plate. SOLUTION: A nearly T shape fillet welded joint having a V shape bevel (a wedge shape gap) at the abutted portion of a flat plate 2 and a vertical plate 1 is welded under the following conditions so as to form an underside bead. In this case, the leg length on a surface bead side is formed to be more than 1/2 and less than 4 times of the thickness of the vertical plate, and the leg length on the underside bead side is formed to be larger than 2 mm and to be not larger than the thickness of the vertical plate. (1) Welding method: straight polarity gas metal arc welding. (2) Shield gas: mixed gas composed of 60% or more of CO<SB>2</SB>, and the remainder composed of two or more gases of Ar, He, H<SB>2</SB>, and O<SB>2</SB>, or 100% of CO<SB>2</SB>gas. (3) Welding wire: solid wire. COPYRIGHT: (C)2009,JPO&INPIT |
