| 摘要 |
PURPOSE:To prevent generation of spatter and obtain uniform stable welding by performing projection welding while forming projections on joining face of a member having greater heat capacity and thereby heating and melting joining faces of two members simultaneously and uniformly. CONSTITUTION:A center boss 1c of joining face 1a side of a gear 1 having greater heat capacity is inserted into a center hole 2a of a fly weight holder 2, and projections 1b are brought into contact with the joining face 2b of the holder 2. This is held between upper and lower electrodes 3, 4, pressed and power is supplied. Since the contacted part between projections 1b of the gear 1 and the holder 2 is high in electric resistance, the contacted part is heated. As projections 1b of the gear 1 are small, heat capacity is also small, and heat capacity of the holer 2 is relatively small. Accordingly, temperature of the two contact parts is raised almost simultaneously and attains melting point of sintered alloy. The two molten parts are pressure welded by pressure, and projection welding is effected without generating spatter. |
