| 摘要 |
PURPOSE:To execute the resistance spot welding of Al-Li alloy having less defect of blowhole, undeposited part, etc., by strenghtening welding pressure in the course of applying electricity for spot welding. CONSTITUTION:Al-Li alloy material with Li content of 1-4% is spot welded. Applying electricity is executed as soon as applying the first welding pressure, successively, applying electricity is continued with applying the second welding pressure stronger than that of the first. For example, to keep pressure and time constant and to change electric current, but the welding pressure is 1200kgf for the first welding pressure and 1800kgf for the second squeezing pressure, the time is a welding of 5 cycles and post heating of 8 cycles. By this method, defects of blow hole, undeposited part, etc., remained by the first pressure are vanished by pressing to conduct electricity, eliminating defected parts, a sound nugget is obtained. |
