| 摘要 |
PURPOSE:To improve welding accuracy by preliminarily subjecting the butt surfaces of a structure to chamfering by as much as the melting down amt. of a bead, then to butt welding. CONSTITUTION:A chamfered part 2 is provided to the upper part on the inside surface of a hole 3 of a work 1 which is a block of parts to form a groove face 4. The groove face is then subjected circumferential butt piercing welding by an electron beam 6 of an electron beam welding device 5. The block work 1 is welded from the upper part of the circumference by flat welding with the electron beam 6 and by the rotation A of the work 1. The weld bead 7 melts down by as much as the amt. corresponding to the chamfered part 2 and stops at the inside edge of the hole 3. The welding condition having the good hole retentivity is thus obtd. and the welding accuracy is improved.
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