| 摘要 |
PURPOSE:To prevent the generation of a weld crack by quick cooling and to eliminate internal strain in electron beam welding of the joint end faces of cylindrical bodies to be fitted by irradiating an electron beam with the deviation from a regular weld zone toward the inside or outside continuously after regular welding for one circumference. CONSTITUTION:The joint C end faces of the cylindrical bodies 1, 2, G, S to be fitted are subjected to regular welding over one circumference l1. The direction is changed 4 successively thereto and the electron beam for shallow melting is irradiated l2 on the outside or inside thereof. The part near the regular weld zone is additionally heated by the irradiation to cool slowly the weld zone thereby preventing the weld crack. The heat input is made uniform on the circumference and the generation of distortion is prevented.
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