| 摘要 |
PURPOSE:To prevent the occurrence of a blowhole by performing the tack- welding in a groove at the opposite side to the main welding side and providing the void between the base of the tack-welding and a groove root part and performing the main welding so as to hole the void. CONSTITUTION:Materials 1 and 1a to be welded are butted against each other and tack-welded 2 at the K or X groove, etc., and the void 5 is provided between the base of the tack-welding 2 and the groove root part of the materials to be welded at the opposite side to the main welding side to perform a first layer welding 3 of the main welding at the opposite side. After the main welding is finished, the tack-welding and the root part are taken away at the gouging and then, the welding is performed. In this way, even if a source to generate gas such as the water content or rust, etc., exists on the groove root part, the blowhole is prevented from being generated on a welded zone of the first layer.
|
