| 摘要 |
PURPOSE:To improve finish accuracy and a dressing effect of a product, by providing a thick-walled part plastically deformed in advance, on a base material junction end face part, when executing butt welding without working a groove to a thin-walled plate or a pipe base material. CONSTITUTION:First of all, a thin-walled base material 1 is held by a suitable fixing means 3 of mechanical force, etc., and its joined end face 4 is forged by a forging tool 5, by which a plastically deformed thickwalled part 6 is bulged out to the end face 4 part. Both the thick-walled part 6 of the base material 1 worked prelimiarily in this way are butted to each other, and both the thick- walled parts 6 are welded so as to be melted and coupled. In this case, it is also possible to butt and weld the thick-walled part 6 of the base material 1 to the end face 4 which is not provided with the thick-walled part 6. In this way, the thick-walled part 6 becomes a weld W, and subsequently, is heated and melted, and the planeness of the base material can be held correctly and uniformly. |
