RESISTANCE WELDING METHOD FOR LOW ELECTRIC RESISTANT METALLIC MEMBERS AND (LOCALLY MODIFIED) LOW ELECTRIC RESISTANT METALLIC MEMBERS FOR RESISTANCE WELDING

摘要

PURPOSE:To prolong the service life of an anode electrode tip in performing spot welding on Al-base rolled sheets by using a DC power source. CONSTITUTION:A locally modified Al-base rolled sheet 5 provided with a high resistance area 4 formed by local melting and alloying processing using a high density energy source on the joining surfaces 3 of a weld zone 2 is used as the Al-base rolled sheet located at the cathode electrode tip 14 side. A modified Al-base rolled sheet 1 is used at the anode electrode tip 15 side. Consequently, since a fused part which is made into a nugget is prevented from being formed with inclination toward the anode electric tip 15 side, the service life of the anode electrode tip 15 can be prolonged.