Tandem Electron Beam Welding (Report-II)

概要

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In case of the deep penetration welding by using the conventional single electron beam welding method, it was seen that the occurrence of internal defects is closely related with the configuration of the weld root with small radius of curvature formed by a narrow diameter beam in high power density. In this weld root, the molten metal is hardly deposited and its cooling-rate is very fast compared with the case of shallow and wide sound weld bead produced by a wide diameter beam in low power density. By the use of the TANDEM ELECTRON BEAM WELDING method, the occurrence of internal defects can be sucessfully prevented and occurence of internal defects can be sucessfully prevented and sound bead is obtained even at the deep penetration condition where the internal defects appear by using the single electron beam welding. In this system, a wide diameter beam of EB-2 in low power density fully penetrates over the depth where the defects are caused by a high power density beam of EB-1. A new and large radius of weld root is produced by EB-2 and its weld root is easily deposited with the molten metal in low cooling-rate.
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