US 9,321,132 B2 · Hybrid arc/laser-welding method for aluminized steel parts using gammagenic elements and a gas containing less than 10% of nitrogen or oxygen

Abstract

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.

Claims13

Dependent claims

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.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/809,652Filed 5 May 2011

Priority

FR 10 5569013 Jul 2010

Published

US 2013/0098878 A125 Apr 2013

Granted

26 Apr 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

B23K 28/02
Welding or cutting not covered by groups B23K5/00 - B23K26/00: combined welding or cutting procedures or apparatus
B23K 26/211
By welding: with interposition of special material to facilitate connection of the parts
B23K 26/322
Taking account of the properties of the material involved: involving coated metal parts
B23K 26/348
In combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding: in combination with…

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

Life of this patent

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

Life of this patent

Abstract

Claims13