| 摘要 |
PURPOSE:To prevent generation of spatter and simplify washing process at the time of assembling by holding two sintered alloy members to be joined in vacuum and performing resistance welding. CONSTITUTION:A gear 1 and a fly weight holder 2 are contained in a vacuum chamber 3, held between an upper electrode 5 and a lower electrode 6, and pressed. Pressure in the vacuum chamber 3 is then reduced by operating a vacuum pump 3a and current is applied to the upper and lower electrodes 5, 6. Since electric resistance between projections 2b of the holder 2 and the gear 1 is high, the contact part is heated to melting point of the sintered alloy. The two molten parts are pressure welded by pressing. Abrupt expansion of internal air does not occur, and thus generation of spatter is prevented. |
