Zinc Coating Influence on Spot-Weldability of Hot-Dip Galvanized Steel Sheets 850273

HOT-DIP galvanized steel sheets have been increasingly used in the automotive industry. However, two major problems occur during spot-welding because of the presence of zinc: 1/ Welding parameters differ from those used for bare sheets 2/ Electrodes life span often decreases. Two products have been thoroughly tested: 1/ Usinor MONOGALĀ® sheet 2/ Two-sides hot-dip galvanized sheet with various zinc-coating thicknesses. Welding parameters have been optimized by the determination of weldability lobes. Both products present a wide range of intensities, provided that weld current and electrode force are increased. The effect of an enventual variation of zinc-coating thickness is negligible.Electrodes life satisfies the FORD 2000 spot welds acceptance test. At last, temperature measurements inside the electrodes have shown the interest in increasing the electrodes tip diameter.


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