Spot welding method

Abstract

Abstract PURPOSE: To eliminate the occurrence of expulsion and let welding of stable quality be done by flowing electric current of more than the limit of the occurrence of expulsion and surface flash as initial current at the time when contact resistance exists between welding members and flowing slightly lower current in the next stage in spot welding. CONSTITUTION: The plates 2, 2' to be welded are pressed by electrode tips 1, 1 and welding current is flowed to spot-weld the plates 2, 2'. In this case, before the inter- electrode voltage passes a peak, that is, when contact resistance persists, 10,000A is flowed as the high current above the limit of the occurrence of expulsion and surface flash. Next, when the passage of the voltage peak is detected, it is changed over to the slightly lower current below the limit of the occurrence of expulsion and surface flash, that is 8,800A being nugget-forming current. By this method, the nugget is gradually saturated, whereby the occurrence of expulsion is suppressed and the welding of stable quality is done. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Yukio Kishie
• 👤 Akira Kawanobe
• 👤 Tatsuya Kachi

Bibliographic Details