Point ring laser welding system and method under vacuum condition

Abstract

The invention discloses a point-loop laser welding system and method under a vacuum condition. The system comprises a solid laser, a point-loop laser optical fiber connected with the solid laser, a laser processing head and a vacuum cabin which are arranged at the end, away from the solid laser, of the point-loop laser optical fiber, and a moving platform arranged in the vacuum cabin. Light emitted by a solid laser directly outputs a point loop light source through a point loop laser fiber and a coaxial single fiber, outputs the point loop light source through a built-in fiber coupler of the laser, outputs the point loop light source through a built-in integrated optical shutter of the laser or outputs the point loop light source through a two-in-one fiber to form a composite point loop laser beam. The point ring laser power ratio is accurately adjusted according to different welding structure conditions, and the adaptability of point ring laser welding to welding joints of different sizes is improved; vacuum laser welding and point ring laser welding are combined, welding spatter is restrained, plasma plume is restrained through low-vacuum environment welding, the fusion depth is increased, and then the welding quality is improved.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and more particularly, relates to a system and method for spot ring laser welding in a vacuum environment. Background technique [0002] In the field of mechanical manufacturing and processing, with the further development of welding technology, laser welding and electron beam welding have been developed, and welding robots have been widely used in industrial production. In particular, laser welding has high power density, fast energy release, and at the same time Its own focus point is smaller, which makes the adhesion between the welded materials better after melting, and will not cause material damage and deformation, thereby better improving work efficiency. However, for some parts with extremely high precision requirements in the electronics, shipbuilding, automotive industries, especially the aerospace industry, the conventional laser welding process is completed in the air, which ...

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Problems solved by technology

[0004] The quality requirements of laser welding in the industry have been continuously improved in recent years. In terms of laser welding of thick plates, laser welding cannot be compared with electron beam welding in terms of welding quality and penetration ability under normal circumstances.

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