| 摘要 |
PURPOSE:To obtain a stable weld zone with no cavity, by electrically conducting twice, and impressing such a welding current that expulsion and surface flash occur within a specific short welding time and then feeding a controlled current additionally. CONSTITUTION:Plural surface-treated sheet with thickness (t) (mm.) are clamped between rod electrodes under optional pressure. Then, the current which causes expulsion and surface flash is impressed for a welding time, of 5.t-10.t cycle. Further, the additional controlled current which is 50-90% of said welding current and causes no exclusion and surface flash is conducted. Thus, the stable weld zone with no cavity is obtained within nearly the same time as before. |
