| 摘要 |
PURPOSE:To reduce the bending angle of a leading end cover and to uniformize a melting depth, by reducing the gap between the mutual engaging parts of a flexible tube and the leading end cover to weld both of them. CONSTITUTION:The leading end part 10b of the flexible tube 10 of an forceps device for an endoscope is inserted in the cylindrical part of the leading end cover 18 to bond both of them by laser welding. At this time, the leading end part 10b of the flexible tube 10 is heated or the leading end cover 18 is cooled, and the flexible tube 10 and the leading end cover 18 are bonded by laser welding in such a state that the gap between the leading end part 10b of the flexible tube 10 and the inner peripheral surface of the leading end cover 18 is reduced. By this method, a lap welding part 35 and an abutted welding part 36 are generated. |
