Composite laser welding method and apparatus

Abstract

A composite laser welding method comprises: detecting a preset region and forming a picture of a region to be welded; calculating region to be welded region and region topography information according to the picture of the region to be welded; emitting a first laser beam, the first laser beam irradiating on the region to be welded to form a first light spot for preheating or holding temperature of the region to be welded; emitting a second laser beam, the second laser beam irradiating on the region to be welded to form a second light spot for welding the region to be welded; transmitting the first laser beam and reflecting the second laser beam; adjusting a circle diameter of the second laser beam according to the region topography information to adjust a diameter of the second light spot, rotating a mirror device and making the mirror device reflect the second laser beam, so that the second light spot moves in the first light spot. The above method can adjust the size ratio and relative position of the first light spot and the second light spot, and is suitable for laser welding of different types of workpieces to be welded. The application further provides a composite laser device.