| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric-driven pressure type projection welding method for preventing defective weld by mechanically preventing the rise delay and response delay of the electric pressure occurring during the welding conduction by using a quick-response spring. SOLUTION: In a projection welding method, two workpieces at least one of which has a projection are stacked one on another, the stacked portion to be welded is pinched between electrodes, the pressure and the welding current required for the welding are thus fed between the electrodes, and the projection is intensively heated and melted to perform the joining. The pressure is controlled by an electric motor, the quick-response spring to supplement shortage of the electric pressure while heating and melting the projection in the initial conduction is disposed on an electrode unit or an electrode moving part. In addition, the quick-response spring is set so that the displacement waveform of the quick-response spring force which oscillates in the time series manner of the initial conduction oscillates in an amplitude equivalent to or greater than the set pressure required for a welding condition. COPYRIGHT: (C)2004,JPO&NCIPI
|
