WELDING ELECTRODE FOR SHEETS OF ALUMINUM OR STEEL, AND METHOD FOR PRODUCING THE ELECTRODE

The electrode for welding sheets of steel or aluminum, with a conductivity greater than or equal to 90% IACS and made of an alloy including, by weight based on the total weight of the alloy, chromium in a proportion higher than or equal to 0.1% and lower than 0.4%, between 0.02 and 0.04% of zirconium, lower than 0.015% of phosphorus, the remainder being copper and less than 0.1% of unavoidable impurities. The electrode structure advantageously includes incoherent chromium precipitates, more than 90% of which have a projected surface area of less than 1 μm2, the precipitates having a size of between 10 and 50 nm. The electrode has a fiber structure of radial fibers, each fiber having a thickness of less than 1 mm and a substantially central fibreless region that has a diameter of less than 5 mm. The invention also relates to a method for producing the electrode.