| 摘要 |
PURPOSE:To improve the quality of a weld zone by performing an upward welding with having a push angle in the welding progressing direction, with controlling the radiating energy of an electon beam so as to come in the specific conditions as well as abutting a backing material to the back face to be welded as well. CONSTITUTION:A same metal backing material 7 is abutted to the back face of the material 3 to be welded and the assembly body of the material 3 to be welded and backing material 7 is formed. The upward welding is performed with having the push angle of 2-10 deg. for the welding progressing direction on the electron beam by reaching the electron beam upto the position where the material 3 to be welded penetrates but the backing material 7 does not penetrates. In this way, the weld zone of good external appearance having no generation of the inner part defect can surely be obtd.
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