Laser welding plume control and molten bath protection method and device

A laser welding and protection device technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of reduced flexibility of laser welding, reduced performance of welded joints, increased thermal deformation of workpieces, etc., to improve energy utilization and welding efficiency, improved stability and weld shape, improved weld protection effect

Inactive Publication Date: 2017-11-17
BEIJING UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

Laser arc hybrid welding can burn off the plume and eliminate the negative effect of the plume through the arc, but this method also reduces the flexibility of laser welding, increa

Method used

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  • Laser welding plume control and molten bath protection method and device
  • Laser welding plume control and molten bath protection method and device
  • Laser welding plume control and molten bath protection method and device

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the examples, but the present invention is not limited to the following examples.

[0019] figure 1 Schematic diagram of a laser welding device for controlling the plume and protecting the molten pool for a coaxial double-layer nozzle, wherein the welding device includes a laser beam 5, a coaxial double-layer nozzle 9 (including an inner tube 10 and an outer tube 11), and an air pump that provides negative pressure The device 14 and the gas cylinder 17 providing shielding gas, wherein the workpiece 1 is the welding object, the deep penetration hole 3, the plume 4, the welding pool and the weld seam 18 are formed during the welding process; during welding, the laser beam 5 acts For the workpiece 1, the positions of the double-layer nozzle 9 and the laser beam 5 are relatively fixed; the negative air pressure and the protective air flow 2 are respectively generated in the inner tube 10 and the outer...

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Abstract

The invention relates to a laser welding plume control and molten bath protection method and device, and belongs to the field of welding. Laser beams generated by a laser device are focused to act on a workpiece, a deep molten small hole and a molten bath are formed; an inner pipe of a double-layer spraying nozzle is placed above a small hole opening and is connected with an air exhauster to enable a stable negative pressure state to be formed at a zone of the small hole opening, and plume sprayed out from the hole quickly escapes out through air exhausting of the inner pipe; and an outer pipe of the double-layer spraying nozzle is arranged above the molten bath, and protective gas is led in for protecting the welding molten bath. According to the laser welding, the negative pressure in the spraying nozzle controls the plume, and the protective gas is led into the outer pipe for protecting the welding molten bath. By means of the local negative pressure environment above the small hole opening, the absorbing and scattering functions of the plume on lasers can be thoroughly avoided, a better transmission channel is provided with the laser beams, the lasers are sufficiently focused on the welding workpiece, and the laser energy using rate is greatly improved; according to the inner pipe of the spraying nozzle, after disturbance of the plume on protective gas flow is removed, the welding molten bath can be better protected by the outer pipe of the spraying nozzle.

Description

technical field [0001] The invention relates to a welding method, which belongs to the technical field of laser material processing, in particular to a laser welding plume control and molten pool protection method and device. Background technique [0002] Laser welding has significant advantages such as high energy density, high welding efficiency, small heat input, small welding deformation, and no direct contact during welding. It is considered to be one of the most advanced material joining technologies in the 21st century and has been widely used. . In recent years, solid-state lasers (such as fiber lasers, disk lasers, and Nd:YAG lasers) have made great progress, and the advantages of such lasers in material processing have become more and more obvious. Taking fiber laser as an example, it has comprehensive advantages such as high electro-optic conversion efficiency, high output power, high beam quality, high processing flexibility, and low operating cost, providing a ...

Claims

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Application Information

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IPC IPC(8): B23K31/12B23K26/14
CPCB23K31/12B23K26/147
Inventor 邹江林李敏肖荣诗哈纳郭士慧王利达
Owner BEIJING UNIV OF TECH
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