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

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 def