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.

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

The invention relates to a shielding gas for arc-welding metal workpieces The invention also relates to a method for arc-welding metal workpieces using a melting electrode, whereby a stream of shielding gas adjacent to the electrode is fed onto the workpiece For the MSG welding, preferably MAG welding of stainless steel, in particular of nickel-based material, special steel or special alloy steel, the invention recommends shielding gases, which in addition to argon, nitrogen and optionally helium contain, a) a proportion of carbon dioxide between 0001 and 19 % by volume, (if the shielding gas contains no helium) and b) a proportion of carbon dioxide between 0001 and 09 % by volume, (if the shielding gas also contains helium)

Shielding gas and arc-welding method

The shielding gas mixture is useful for MIG brazing galvanized steel. The gas mixture consists essentially of, by volume percent, about 0.5 to 4 carbon dioxide, about 0.2 to 1 hydrogen, and the balance is argon and incidental impurities.

Shielding gas mixture for MIG brazing

A welding shield gas comprising an inert gas and nitrogen gas, where the concentration of the nitrogen gas is 1 to 95 vol %; or comprising an inert gas and a helium gas, where the concentration of the helium gas is 35 to 95 vol %; or comprising an inert gas, nitrogen gas, and a helium gas, wherein the concentration of the nitrogen gas is not less than 1 vol % and less than 65 vol % and the concentration of the helium gas is 35 to 95 vol %. This shield gas can be used in the non-consumable electrode arc welding of a welded material consisting of stainless steel.

Welding shield gas and welding method

The invention relates to an electric arc welding method for welding at least one metal part including an aluminum-based surface coating, using a shielding gas. According to the invention, the metal of the aforementioned metal part is melted by the electric arc alone without the use of any laser beam. The invention is characterized in that the shielding gas comprises a mixture of argon and/or helium, nitrogen, and an oxidizing compound selected from oxygen and carbon dioxide.

Method for arc-welding aluminum-coated metal parts using oxidizing gas

A shielding gas mixture for gas-metal arc welding of austenitic stainless steel is provided in which the gas mixture comprises from about 2 to about 5% carbon dioxide, from about 1 to about 4% nitrogen, and the balance being argon. Also, a process for welding austenitic stainless steel is provided by forming an electric arc between a nonconsumable electrode and the workpiece and in which the gas mixture is used.

De Abreu Macedo William

Papers

Shielding gas mixture for gas-metal arc welding

Shielding gas mixture for gas-metal electric arc welding