Plasma-side-suction negative pressure device for laser welding

Abstract

The invention relates to a plasma-side-suction negative pressure device for laser welding. The plasma-side-suction negative pressure device can be mounted on any laser welding gun head. A negative pressure chamber device is fixed with the laser welding gun head and can move relative to a workpiece to be welded; and the negative pressure chamber device is arranged above a welding puddle area on the surface of the workpiece to be welded and is used for quickly exhausting, so that local negative pressure lower than the normal atmospheric pressure is generated in a closed chamber fixed in the laser welding gun head, and a negative pressure environment can be formed around a welding puddle. With the adoption of the plasma-side-suction negative pressure device for laser welding, the plasma generation during the process of high-power laser deep penetration welding can be effectively inhibited, and the weld-seam deep-layer air holes caused by a keyhole effect are eliminated. The plasma-side-suction negative pressure device for laser welding has the advantages of no restriction of workpiece size, flexibility and convenience in use, good stability, higher welding quality and increased stability in a welding process.

Description

Technical field [0001] The invention is suitable for the field of laser welding, and is particularly suitable for a laser welding plasma side suction negative pressure device for welding medium-thick plates and large-thick plates with high-power lasers. [0002] Background technique [0003] As a high-energy beam welding method, laser welding has many advantages such as fast speed, high efficiency, large weld depth-to-width ratio, small heat-affected zone, and small workpiece deformation. Compared with vacuum electron beam welding, it does not need a vacuum chamber and is suitable for It has strong performance and has no limitation on the size of welding workpieces. It has been widely used in the welding of thin-walled components such as automobile bodies. However, in the manufacturing fields of heavy machinery, ships, nuclear power, steam turbine rotors, major equipment, etc., it has not yet been effectively applied, especially in the welding of large thickness materials over 40m...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a laser welding plasma side suction negative pressure device to solve the problem of plasma generated during high-power laser deep penetration welding in the prior art and the deep pores of the weld seam caused by the pinhole effect, thus there is a large vacuum The chamber pumping efficiency is low and the size of the workpiece is limited. It is also beneficial to solve the problems of unstable plasma suppression effect and difficult control of pores caused by side-blown protective gas.

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