In the car body, most of the body-in-white splicing work is completed by resistance welding. There are hanging spot welding machines and robot spot welding machines commonly used in factories. The use ratio of these two spot welders still depends on the automation rate of the workshop. For example, Wuhan GM, the workshop automation rate should be above 97%, mainly robot spot welding machine. Suspension spot welding machine is mainly used in some places where robots are convenient to use or need maintenance in the later stage.
2) Laser welding/laser brazing
There are three kinds of laser welding: laser welding, laser brazing and remote laser scanning welding. Laser welding is mainly used on the top cover, back cover and floor; Laser welding and laser brazing have been used in our workshop, but remote laser scanning welding is useless. Laser brazing is mainly used for the roof and rear cover, in which the welding angle of the roof is required to be 90 5 degrees, the rear cover is required to be at the bisector of the angle of 5 degrees, and laser brazing is not used at the corner of the rear cover. The weld gap between the roof and the side wall should be controlled at 0.3 mm. Laser welding is not only used for tailor welding of the roof and the side wall, but also for welding the bottom plate and the side wall and the roof beam.