ENDOSCOPIC LASER WELDING METHOD AND ENDOSCOPIC LASER WELDING MEMBER

摘要

An endoscopic laser welding method, wherein the welding depth H from a cylindrical external member to a coiled internal member, with helical weld beads in a non-overlapping arrangement, satisfies the relationship h c, and the welding energy E satisfies the relationship E2 = E = E1 when the cylindrical external member and the coiled internal member are welded and secured together and the welding depth reaches the welding depth H, where h is the sheet thickness of the cylindrical external member, hc is the sheet thickness of the coiled internal member, E1 is the maximum welding energy of laser welding that does not alter the internal and external diameters of the cylindrical external member in a location where the coiled internal member is not positioned on the interior side of the cylindrical external member, and E2 is the minimum welding energy that allows the cylindrical external member and the coiled internal member to be welded and secured together.