Hybrid arc/laser-welding method for aluminized steel parts using gammagenic elements and a gas containing less than 10% of nitrogen or oxygen

摘要

The invention relates to a hybrid laser/arc-welding method using an electric arc and a laser beam that are combined together within a single welding melt to which molten metal is supplied by melting a filler wire, wherein the welding melt is provided on at least one steel part including an aluminum surface coating, and a protective gas is used, characterized in that the filler wire contains at least 3 wt % of one or more gammagenic elements, in particular the gammagenic elements selected from C, Mn, Ni and N, and the protective gas consists of helium and/or argon with the addition of at least 10 vol % of nitrogen or oxygen. The method of the invention is particularly suitable for welding end-welded flanks used in the field of manufacturing automobiles or for tube welding.

主权项

1. A laser/arc hybrid welding process using an electric arc and a laser beam in combination together in a single weld pool, comprising;
providing the weld metal by melting a consumable wire, producing the weld pool in at least one steel workpiece comprising an aluminum-based surface coating, and using a shielding gas,wherein the consumable wire contains at least 3 wt % and at most 20 wt % of one or more gammagenic elements and the shielding gas is formed of at least 2 vol % to less than 10 vol % of nitrogen or oxygen, and helium or argon,thereby promoting the formation of a uniform martensite microstructure in a weld-metal zone formed by hot-drawing and quenching.