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Laser beam welding method with a metal vapour capillary formation control

A laser beam welding, laser beam technology, applied in the direction of laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of inability to improve weld quality, capillary blocking, capillary instability, etc.

Inactive Publication Date: 2008-10-22
LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] These methods do not improve the quality of the resulting weld because the gas flow only exerts pressure on the weld puddle, forcing the molten metal towards the capillary, making the capillary unstable or very easily blocked

Method used

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  • Laser beam welding method with a metal vapour capillary formation control
  • Laser beam welding method with a metal vapour capillary formation control
  • Laser beam welding method with a metal vapour capillary formation control

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Experimental program
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Embodiment Construction

[0050] From Figure 1 to 4 It can be seen that the coaxial nozzle is a nozzle formed by at least two concentric air supply pipes.

[0051] figure 1 The first form of coaxial nozzle is shown. In the center of the nozzle, a fast gas jet is delivered towards the pore opening through an orifice 1 with a diameter between 0.2 and 3 mm.

[0052] The shielding gas in turn diffuses in the crown 2 concentric with the opening 1. The profile of the crown portion 2 can be selected so that the wall effect can be obtained, that is, the direction of the slow gas flow is along the wall curve, as shown by the vector 3.

[0053] figure 2 A nozzle form that uses the wall effect to concentrate the fast gas flow along the axis of the laser beam is shown. In this embodiment, three gas passages are provided: an axial passage 4 for slow gas delivery and low flow rate, which is mainly used to prevent any contaminants from entering the laser optical device backwards; and to guide the rapid The first per...

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PUM

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Abstract

The invention relates to a method for welding at least one, preferably two metal parts to each other, by a laser beam consisting in using a laser beam (10), a first gas flow and a welding nozzle provided with an output orifice which is passed through by the laser beam and the first gas flow and in welding the part(s) by melting the metal thereof at a point of the laser beam impact with said weldable part(s) in such a way that a capillary (11) or a key hole (12) filled with metal vapour is formed. During welding, the first gas flow is directed only to the aperture of the metal vapour capillary in a direction perpendicular to the weldable part(s) in such a way that a dynamic gas pressure is produced.

Description

Technical field [0001] The present invention relates to a laser welding method in which the hydrodynamic properties of the molten pool during the welding process are controlled due to the air flow concentrated on the capillary formed at the point of application of the laser beam. Background technique [0002] In laser beam welding, the formation of a weld between two workpieces is based on the melting and evaporation of materials at the point of application of the laser beam. [0003] For a sufficiently high specific power density, that is, a few MW / cm 2 , Forming capillaries or pores filled with metal vapor in the material, they enable energy to be directly transferred to the core part of the material. [0004] The capillary wall is formed of molten metal and is maintained due to the dynamic equilibrium established by the internal vapor. Depending on the movement, the molten metal passes around the capillary and forms a "melt pool" behind it. [0005] The presence of the cavity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/14
CPCB23K26/1476B23K26/1441B23K26/1447B23K2203/04B23K2203/10B23K26/1437B23K26/1436B23K2103/05B23K2103/04B23K2103/10
Inventor F·白里安E·弗娜S·斯里马尼R·法布洛F·科斯特
Owner LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PROCEDES GEORGES CLAUDE