A non-penetrating laser welding method and system

Abstract

The invention discloses a non-penetrating laser welding method and a non-penetrating laser welding system. The non-penetrating laser welding method comprises the following steps: firstly, providing a first parent material and a second parent material which are required to be overlapped and welded; secondly, vertically overlapping and clamping the first parent material and the second parent material; thirdly, providing a laser welding system, wherein the laser welding system is provided with a first laser head and a second laser head, and the laser beams which are focused and emitted by the first laser head and the second laser head are arranged side by side in a welding direction and are distributed symmetrically; fourthly, starting the laser welding system, wherein a dual-laser beam which is formed by respectively focusing the first laser head and the second laser head is inclined to radiate the surface of the first parent material to complete a welding process. The invention also discloses a non-penetrating laser welding system. Compared with the prior art, the non-penetrating laser welding method and the non-penetrating laser welding system have a good welding effect, and are simple in process, easy to control and low in cost.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a non-penetrating double-beam laser welding method and system. Background technique [0002] Laser welding is a high-energy-density welding method in which laser is used as an energy carrier. It is the application of laser processing technology. [0003] One of the important aspects of laser welding, the application of laser technology in welding has greatly promoted the development of welding technology. Laser welding can be welded at room temperature or under special conditions due to its fast welding speed, large depth, and small deformation, and the welding equipment is simple. And other advantages, widely used in the industrial field. [0004] Laser welding is divided into two modes: laser heat conduction welding and laser deep penetration welding. Laser heat conduction welding is similar to tungsten [0005] Extreme argon arc welding, welding efficiency is low. Laser deep p...

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Problems solved by technology

[0008] The invention patent with the publication number "CN 104002044 B" discloses a non-penetrating laser welding equipment and welding method. By capturing the temperature on the back of the weld in real time, the welding penetration can be obtained, and the laser power can be adjusted in real time. To a certain extent, it solves the problem of precise control of welding penetration during laser non-penetration welding, but the technical solution still has the following problems: in this method, the corresponding relationship between the temperature of the back of the weld and the welding penetration is difficult to obtain accurately in actual production, and Complex process

[0009] The utility model patent with the publication number "CN 204524558 U" discloses a device for laser non-penetration welding. The workpiece to be welded is placed on a workbench with cooling water, which solves the problem of laser non-penetration welding to a certain extent. The problem of thermal deformation on the surface of the lower steel material, but this technical solution still has the following problems: In this method, cooling the lower steel material with 20°C cooling water has a limited degree of improvement on the thermal deformation of the lower steel material, and there is nothing that can be done about the oxidation and discoloration of the outer surface of the lower steel material

[0010] The invention patent with the publication number "CN 103008884 A" discloses a laser lap non-penetration welding method. The non-penetration surface is covered with a protective film to isolate the air for welding, which solves the problem of exposed steel structure of stainless steel rail cars to a certain extent. Oxidation of the non-penetrated surface, but this technical solution still has the following problems: This method is difficult to control the back burn or even burn through caused by factors such as fluctuations in laser parameters during the welding process

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