| 摘要 |
Provided are a welding method and a weld joint with which the fatigue strength of the box-welded joint of a gusset plate and a high-tensile steel can be dramatically improved. A welding method whereby a gusset plate is welded to high-tensile steel by means of box-welding, with a bead having a length of 17mm or greater being formed at the ends of the gusset plate in the lengthwise direction using a welding material for which the martensite transformation starting temperature of the welding metal is 350°C or less. In addition, a weld joint formed by welding a gusset plate to high-tensile steel using the aforementioned method. In addition, a method for repairing or reinforcing, by means of welding, a box-welded part comprising a gusset in an existing steel structure and a parent material, wherein a bead is formed such that the length of the bead part from the ends of a gusset plate of the box-welded part is 17 mm or greater in the lengthwise direction at the ends of the gusset plate, using a welding material for which the martensite transformation starting temperature of the welding metal is 350°C or less. |
