Fiber laser has the characteristics of high beam quality and high energy. In the continuous welding state, compared with the same power YAG laser, it has the characteristics of deep welding depth and good welding strength. At present, it can be used in most laser welding fields, such as mobile phones, tablets, automobiles, kitchens and toilets, hardware, small household appliances and so on. The equipment has the characteristics of no consumables, long life and low failure rate, and has been popularized in the laser welding industry.