Laser welding plasma side suction negative pressure device and laser welding system

Abstract

The invention provides a plasma side-suction negative pressure device and a laser welding system in the laser welding process. The plasma side-suction negative pressure device comprises a lens module and a negative pressure module, wherein the lens module and the negative pressure module are connected; the lens module is used for fixing a lens; the negative pressure module is used for forming a negative pressure environment above a welding seam. The negative pressure module comprises a negative pressure cavity and an exhaust tube communicated with the negative pressure cavity. The lens module is arranged on the upper portion of the negative pressure cavity, and the lower portion of the negative pressure cavity can make contact with a member to be welded; the exhaust tube is arranged on the side wall of the negative pressure cavity; the negative pressure environment can be formed in the negative pressure cavity by connecting an exhaust device and the exhaust tube. Compared with the prior art, due to the negative pressure cavity, the size of an exhaust cavity above a weldment is reduced, the airtightness design of the cavity is improved, and exhaust efficiency is improved. Therefore, the vacuum degree of the negative pressure cavity is enhanced, and the effect for restraining plasma from being generated in the laser welding process is better.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a laser welding plasma side suction negative pressure device and a laser welding system suitable for welding large-sized thick plates and medium-thick plates. Background technique [0002] High-power lasers have the advantages of fast welding speed, small deformation after welding, and good quality of welded joints in the welding of medium and thick plates. Making full use of the advantages of lasers and realizing laser welding of large thickness plates has always been a matter of great concern in academia and industry. The main reason why laser welding is not widely used on large-thickness plates is that laser welding is usually carried out under atmospheric pressure or protective gas environment. Under this condition, the photoinduced plasma generated by laser welding (mainly for CO 2 Lasers) and metal vapor (mainly for YAG lasers, fiber lasers and disk lasers, etc.) have scatteri...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a laser welding plasma side suction negative pressure device to solve the problem that the laser welding plasma side suction negative pressure device in the prior art blows inert protective gas through the lower gas filling hole to form a gas curtain to isolate the The air and the environment inside the chamber, while the lower end of the negative pressure chamber is open, and the amount of air intake is large, resulting in a limited vacuum degree in the negative pressure chamber, which makes the effect of suppressing the plasma poor.

[0007] Another object of the present invention is to provide a laser welding system comprising the above-mentioned laser welding plasma side suction negative pressure device, to solve the problem that the laser welding plasma side suction negative pressure device in the prior art blows through the lower air hole during welding. The inert protective gas is injected to form an air curtain to isolate the air and the environment in the chamber, and the lower end of the negative pressure chamber is open, and the air intake is large, resulting in a limited vacuum degree in the negative pressure chamber, which makes the effect of suppressing the plasma poor. question

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