in recent years, with the development of new energy vehicle and lithium battery industry, the demand for welding copper materials is increasing, Welding of Non-ferrous metal materials such as copper alloys is already difficult to deal with because of the traditional infrared laser band and the peak absorption of copper materials, For Cu, Al and other materials, the absorption rate of blue light is 3-20 times that of infrared light, Deep penetration is achieved by using heat conduction mode in blu-ray laser welding, Compared with the infrared laser deep penetration welding mode, this paper adopts the single-tube blue laser beam combination technology with TO9 package structure. Sharp 5W 450nm high power blue light semiconductor single tube, The principle and optical path are designed by ZEMAX software, Solidworks is used to design the structure of high power blue light semi-conductor laser, Then through the Jun and precision machine six-dimensional real machine installation and debugging, 20 blue-ray semi-conductor laser with a power of 5 W and a width of 50 μm based on TO9 packaging structure, Fiber output power of 86.4 W, to meet the basic sheet metal copper laser welding applications.