METHOD FOR WELDING ANGLE PART OF WELDED JOINT PART OF BOX STRUCTURAL MATERIAL

摘要

PURPOSE: To efficiently weld the angle parts of butt welded joint parts of box structural materials on construction site without the occurrence of defects. CONSTITUTION: One surface (a) is welded by a welding torch 6 at prescribed anglesθ1 ,θ2 with the progressing direction of the side face of the box structural materials 1 and upward at the time of welding the angle parts a1 to d1 of the box structural materials of the welded joint parts 2 formed by butting the welding ends of the box structural materials 1 against each other from above and below. The welding torch 6 is once retreated in a diagonal M direction at the time of arriving at the welding interruption point P1 of the angle parts existing on the diagonal line M of the box structural materials 1 and moving to the adjacent surface (b) thereof. The welding torch 6 is changed in its position to this angle with this surface at the time of bringing the torch close to the adjacent surface 6 again and the welding of this surface is executed.