In the future, 3C products will be upgraded in the direction of high integration and high precision, and its product internals will become smaller and smaller, and the degree of electronic integration will become higher and higher. Therefore, the appearance, deformation and drawing force of the internal structural parts have higher and higher requirements for welding technology. Laser products because of its high energy, high precision, high directional characteristics, making the product more lightweight, thin, better stability, is widely used in 3C products in structural parts welding and other applications.