Non-penetration laser welding method

Abstract

The invention relates to a non-penetration laser welding method. The non-penetration laser welding method is characterized by comprising the steps that first, impurities on the upper surface and lower surface of first parent metal (2) and the upper surface and lower surface of second parent metal (3) are removed, and then the first parent metal and the second parent metal are accurately overlapped and clamped with a welding jig; second, a vacuum cover (6) is connected to a laser welding head (7) and can rotate on the laser welding head; third, the laser welding head is moved to the position above a workpiece so that the vacuum cover can keep a certain distance away from the workpiece surface; fourth, compressed air of certain pressure is supplied to an air inlet (8) of the vacuum cover; fifth, industrial liquid nitrogen is injected to the lower surface of the workpiece through a spray gun (1) of a special device; and sixth, a laser welding system is started, a laser beam (4) is vertically radiated to the upper surface of the workpiece, and the laser beam and the spray gun (1) move synchronously to complete the welding process. According to the non-penetration laser welding method, the local vacuum environment and liquid nitrogen cooling act synchronously, so that thermal deformation and oxidizing discoloration on the back face of a welding seam during non-penetration laser welding are avoided, and practicability is high.

Description

technical field [0001] The invention relates to a laser welding method, in particular to a non-penetrating laser welding method. Background technique [0002] Laser welding is a high-energy-density welding method that uses laser as an energy carrier. It is one of the important aspects of the application of laser processing technology. The application of laser technology in welding has greatly promoted the development of welding technology. Laser welding has fast welding speed. , large depth, small deformation, can be welded at room temperature or under special conditions, and the welding equipment is simple, etc., and has been widely used in the industrial field. [0003] Laser welding is divided into two modes: laser heat conduction welding and laser deep penetration welding. Laser heat conduction welding is similar to argon tungsten arc welding, and the welding efficiency is low. Laser deep penetration welding uses high energy density (greater than 10 6 W / cm 2 ) The l...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of poor stability in the current laser non-penetration welding process, prone to burn deformation on the back of the weld, oxidation and discoloration, etc.

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