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Mechanisms of resistance welding electrode wear on galvanized steel
Published June 03, 1996 by ISATA - Dusseldorf Trade Fair in United Kingdom
Event: ISATA 1996
Galvanized coatings on automotive sheet steel, while significantly improving their corrosion resistance, also reduce the service life of resistance welding electrodes used in joining these materials. Alloying of the zinc-rich coating with the copper electrode, and the effect of this alloy formation on deformation at the electrode face during welding, are major factors in this reduced electrode life. Aluminum, as a minor alloying addition to hot dip galvanize coatings, also has a significant influence on the wear process. This presentation will briefly review metallurgical aspects of resistance welding electrode wear on galvanized steels. Effects of coating composition on electrode life, electrode-coating interactions, and the associated deformation of the electrode during service will be discussed.