| 摘要 |
PURPOSE:To obtain a welding joined part having high fatigue strength by irradiating the surface of an armature part by a laser beam with respect to a corner part between the armature and a plate spring and forming a head fillet. CONSTITUTION:At the time of welding an armature 4 and a plate spring which are integrated into a wire dot printer head, first of all, in a state that the armature 4 has been superposed on a free end side of a plate spring lever piece 5b, spot welding is performed to two parts 13 of the opposed surface. Subsequently, fillet welding is executed by irradiating a corner part between the end face of the armature 4 and the upper face of the lever piece 5b by laser beam 15 from a laser device 14. By this welding, a fillet 16 of a hard alloy which has been generated by a reaction of a molten metal of the armature 4 and a chemical component of a plate spring material is formed. In such a way, a welding joined part having high fatigue strength is obtained, and the durability of a printer head whose printing operation is executed at a high speed and repeatedly is raised. |
