| 摘要 |
PURPOSE:To heighten the quality of welding work, to increase efficiency and to simplify equipment in joining the barrel of a cylindrical container by welding, by making welding, of peripheral joint in flat position while placing the container on a fix. CONSTITUTION:Left and right divided parts 1a, 1b of a barrel that constitute the barrel part of a large cylindrical container made of thick plate are placed on a fixing jig 4 concentrically and forming a gap 3 between facing end parts 2a, 2b, and a peripheral joint groove 5 is formed by the two end parts 2a, 2b. The gap 3 of the groove 5 is made as narrow as possible within the limit that a welding torch can make butt welding in flat position in the gap. A backing strip 6 is provided at the outside of the lower part of the groove 5, and a backing strip 7 is provided at the inside of the upper part of the groove to prevent leaking of deposited metal. The groove 5 is welded by reciprocating the torch parallel to the end face of the peripheral joint in the horizontal direction in flat position. Deposited metals are lapped successively, and the peripheral joint groove 5 is welded from below upward. |
