LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE
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[0008] During the mechanical tests of the joint after welding, stretching and subsequent heat treatment, phase regions that have not undergone martensitic transformation can lead to cracking or even shearing of the welded joint, because these regions of the weld contain aluminum and their Lower strength than deposited metal
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Examples
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example 1
[0059] In this example, the thickness of the workpiece is 1.7 mm.
[0060] The gas used is ARCAL37 mixed gas (composition: 70% by volume helium, 30% by volume argon), and 3% oxygen is added to the mixed gas. Air Liquide sells The ARCAL37 mixed gas.
[0061] The welding torch used is a MIG welding torch sold by OTC. The welding torch is supplied with a 1.2mm diameter filler welding wire. In addition to iron, the welding wire also includes manganese with a weight content of about 20%, and the weight is 3m / min. Speed delivery.
[0062] Laser source is CO 2 The power of the laser oscillator is 8 kilowatts.
[0063] The results obtained show that if the obtained weld bead has a uniform microstructure, a high proportion of manganese (ie, about 20% by weight of Mn) in the weld area will make the test result much better than in the weld bead The result of a test with very little manganese (ie, about 2% manganese).
[0064] After quenching heat treatment (a cooling rate of about 30°C / s betw...
example 2
[0067] In this example, the thickness of the workpiece is 2.3 mm, and the gas used is a mixed gas formed by ARCAL 37 and 3% oxygen by volume.
[0068] The welding torch used is an OTC MIG welding torch, which supplies Nic535 (solid welding wire) filler wire with a diameter of 1.2mm, which contains iron, and 0.7% carbon (C) and 2% manganese as gamma elements (Mn), the welding wire is transported at a rate of 3m / min.
[0069] The laser source is 12 kW CO 2 Laser oscillator.
[0070] The results obtained show that the amount of gamma elements (ie, Mn and C) in the welding wire is sufficient to offset the effect of inhibiting austenite transformation caused by the presence of aluminum in the weld metal region. Specifically, the photomicrograph shows that the white phase area has completely disappeared or has been greatly reduced.
[0071] In addition, it was observed that after austenitization and quenching, the tensile strength of the joint was equal to the tensile strength of the base ...
example 3
[0074] Example 3 is similar to Example 2 above, except that the laser / arc hybrid welding method according to the present invention is used for welding workpieces with a thickness of 2.3 mm and ARCAL37 mixed gas formed by 70% helium and 30% argon and 6% The additional nitrogen is used as a protective gas.
[0075] The welding torch, filler wire and other welding conditions are the same as in Example 2.
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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.
Description
Technical field [0001] The present invention relates to a laser / arc hybrid welding method for welding steel parts / steel workpieces containing aluminum-based surface coatings (especially aluminum / silicon coatings), which uses welding wires containing one or more gamma elements , And preferably use a protective gas formed of argon and / or helium and a small proportion of nitrogen or oxygen. Background technique [0002] Specific steel called aluminized steel (such as USIBOR TM Steel) because it is plated with aluminum or plated with aluminum-based alloys, it has high mechanical properties after hot stretching, and therefore in order to reduce weight, this steel is increasingly used in the field of automobile manufacturing. [0003] Specifically, these steels are designed to be quenched during a hot drawing operation after heat treatment, thereby obtaining mechanical properties that enable a very significant reduction in the weight of the vehicle compared to standard high yield strengt...
Claims
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Application Information
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