HIGH SPEED ELECTRON BEAM WELDING METHOD

PURPOSE:To perform high speed welding while preventing head shape defect, by placing a thin plate on a material to be welded, and removing the low energy density part of a beam, and converging only the high energy density beam. CONSTITUTION:The thin plate 2 is fitted on the material 1 to be welded by temporary welding with a spacer 3 between. An electron beam 5 emitted from an electron gun 4 strikes the thin plate 2 through a convergent lens and a deflecting coil system 6 to remove the low energy density part and only the high energy density beam strikes the material 1 to be welded to perform penetration welding, forming a bead 7. The thin plate 2 uses a cold rolled steel plate SPCC suitably and the spacer 3 uses an iron material preferably for the temporary welding between the material 1 to be welded and thin plate 2.