| 摘要 |
PURPOSE:To easily weld even materials with a complicated shape by reducing the distance between the abutting surfaces corresponding to each other at the end position at least in the surface direction to cross the plate thickness direction. CONSTITUTION:The abutting surfaces 1a and 2a between base metal 2 to be welded provided with a projecting part 3 and the other base metal 1 to be welded are provided in parallel on the same plane so that these surfaces are corresponded to each other. When the distance between the abutting surfaces 1a and 2a at this time is denoted by delta, at the position of the base metal 2 to be welded where the projecting part 3 is provided, when the quantity of projection of the projecting part 3 is denoted by deltao, the distance between the abutting surfaces is made to deltaS=delta-deltao and a gap at the position where the projecting part 3 is provided is reduced substantially by for deltao. Accordingly, a welding start part 4 is made in the same state as being tacked by filler metal and welding is performed very easily and residual stress is prevented from being generated and the deposition surface without a weld zone bead is formed by making the position where the projecting part 3 is provided to the welding start part 4 of butt welding. |
