| 摘要 |
PURPOSE:To prevent easily the occurrence of welding distortion in welding one face of members to be welded, by heating a facing part of a welding point in the opposite face by the amount of heat which is nearly equal to heat input caused by welding. CONSTITUTION:When welding a horizontal member 7 to one side face of a vertical member 8 by a submerged arc welding machine 9, a coupling member 18 is connected to the welding machine 9, and the tip is extended to the opposite side of the welding face of the vertical member 8. A gas burner 19 is attached to a holding member 20 provided on the tip of the coupling member 18, and the tip of the burner 19 is directed to a point C on the opposite side face that faces a fillet welding point B of the vertical member 8 and the horizontal member 7. The horizontal member 7 is welded to the vertical member while moving the welding machine 9 mounted on a truck along the fillet weld zone. At the same time, the opposite side of the welding point of the vertical member 8 is heated by the burner 19 with the amount of heat nearly equal to heat input of welding. Bending of the vertical member 8 to the direction A due to distortion caused by one face welding can be prevented. |
