| 摘要 |
PURPOSE:To prevent the damage of materials to be welded by the electron beam after penetration through said materials and to trim the bead shape on the rear side of the materials to be welded by using an insulator consisting of a material such as molding sand having an optional shape for the backing material of the materials to be welded for electron beam welding. CONSTITUTION:Materials 5, 6 to be welded are combined and an insulator such as molding sand, concrete having fluidity is adequately packed to the rear surface side of a groove 7 and is cured to form a backing material 8. An electron beam 9 penetrates through a groove 7 while carrying part of a molten metal A in the stage of irradiating the beam 9 and welding the material, but the material 8 shuts off thoroughly the beam 9 and prevents the damage in the part B of another material 5. The material 8 blocks further part of the molten metal A on the rear side of the groove 7 thereby trimming the rear penetration bead shape of the groove 7. |
