| 摘要 |
PURPOSE:To prevent the decrease in the concn. of chromium in a deposited metal and the deterioration in corrosion resistance while decreasing the penetration of a base material by decreasing the current for build-up welding at the end edge for the welding and increasing the overlap with the previous deposited metal. CONSTITUTION:The first bead 1 is placed at the position A' on the side inner by several beads from the beginning end A for welding, and ordinary welding is progressed in order of 2, 3. When a deposited metal (n) is formed to the position B' backward by several beads from the build-up terminal end B, the welding current is decreased and the welding is progressed to the terminal end B by increasing overlap up to the deposited metal n+1-n+3. The welding is then returned to the beginning end and while the welding current is held decreased, the welding is progressed to the end A in succession to the initial deposited metal 1 by increasing the overlap in order of n+4-n+6 in a backward direction. The welding current is returned to the ordinary current, and the next row is welded in parallel with the metal 1. The above-mentioned procedure is repeated until the build-up welding of the 1st layer is completed. |
