Device and method for regulating and controlling performance of laser melt-brazing welding joint based on external magnetic field

Abstract

The invention discloses a device and method for regulating and controlling the performance of a laser melt-brazing welding joint based on an external magnetic field. The device comprises a welding base, a welding platform and a controller, a plurality of telescopic supporting columns are arranged between the welding base and the welding platform, and a magnetic field generating device is arranged on the surface of the welding base. Fixing clamps are symmetrically arranged on the welding platform, and a welding robot, a thermal imaging thermodetector and a high-speed camera are arranged above the fixing clamps. The controller is connected with the telescopic supporting columns, the fixing clamps, the thermal imaging thermodetector, the high-speed camera and an optical fiber laser, and the optical fiber laser is connected with the welding robot. And the controller is communicated with an upper computer. According to the device and method, the problem that in the friction stir welding process, aluminum alloy deformation is large is solved, the problem that in the fusion welding process, intermetallic compounds are likely to be generated on an aluminum steel dissimilar material interface is also solved, meanwhile, metal does not need to be filled in a powder feeding or wire feeding mode, the welding quality and efficiency can be greatly improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of performance control of laser welding joints, in particular to a performance control device and method for laser welding and brazing welding joints based on an external magnetic field. Background technique [0002] With the introduction of lightweight automobiles, welded structures of aluminum alloys and traditional steels have begun to be used in body design. Since the aluminum / steel dissimilar metals are prone to metallurgical reactions during the welding process to form intermetallic compounds with high brittleness and hardness, the brittleness and hardness of the joints increase and the mechanical properties of the components are reduced. [0003] Existing welding methods mainly include fusion welding and friction stir welding, and their defects are as follows: [0004] 1. Fusion welding is not easy to control the heat input during the welding process, which will cause a large amount of intermetallic compounds ...

AI Technical Summary

Problems solved by technology

[0004] 1. Fusion welding is not easy to control the heat input during the welding process, which will cause a large amount of intermetallic compounds to be generated in the joint;

[0005] 2. Friction stir welding will cause excessive deformation of the aluminum alloy during the welding process, and the applicability is low

However, filling the metal by spraying powder will cause water vapor to be involved in the welding process, and defects such as pores and cracks will occur due to the difference in the thermal expansion coefficient of different phases after the weld is formed; while filling the metal by filling wire requires auxiliary feeding. Wire equipment and precise control of the relative position of the spot and the welding wire, the equipment structure is highly complex and technically difficult

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