Patent ID: 8274010

Claim:
A method for welding a plurality of aluminum to aluminum and plurality of steel to steel electric resistance welds using the same welder comprising: providing a resistance spot welder with a pair of weld electrodes having an electrode face radius of curvature in the range between 20 millimeters and 40 millimeters and said electrode face being textured with a roughness in the range of 2 micrometers to 50 micrometers; first making a series of aluminum to aluminum welds; after completing the aluminum to aluminum welds, then making a series of steel to steel welds; after completing the steel to steel welds then cleaning the weld electrodes to remove any buildup of aluminum on the electrodes and retexturing the electrode face to the roughness of 2 micrometers to 50 micrometers prior to next beginning a new series of aluminum to aluminum welds.