WELDING METHOD USING HIGH ENERGY DENSITY BEAM

摘要

PROBLEM TO BE SOLVED: To provide a welding method capable of enhancing the precision and quality of a product and welding materials to be welded over the whole range of a plate thickness direction of the material by using an inexpensive apparatus. SOLUTION: Level difference parts 12 are formed on the welding surfaces 13 of two materials 11 to be welded by cutting the range portions from the incident side of a high energy density beam 17 to a proper portion on the welding surface in parallel to the welding surfaces and at not over than the diameter of the high energy density beam with a butt welding surface as the reference into the size having not less than 1/4 of the beam diameter. The butt welding surfaces 15 are melted and solidified with the high energy density beam 17 through a slit 16 formed with the level different parts 12 in the state of butting the butt welding surfaces 15 of the materials 11. Successively, the butted portion where the level difference parts are faded away by a solidification shrinkage action when the butt welding surfaces are welded, is melted and solidified with the high energy density beam to weld the whole range of the welding surfaces of the materials 11.