The welding line of automobile is mainly white body welding, which is composed of body frame, engine hood, trunk lid and left and right door panel welding assembly. The skeleton structure of the car body is composed of floor welding assembly, left and right front longitudinal beam and wheel housing welding assembly, left and right side wall welding assembly, front wall welding assembly, top cover and front and rear crossbeam, rear baffle, left and right rear longitudinal beam and rear wheel housing welding assembly, and rear wall welding assembly.

The welding line of automobile is mainly white body welding, which is composed of body frame, engine hood, trunk lid and left and right door panel welding assembly. The skeleton structure of the car body is composed of floor welding assembly, left and right front longitudinal beam and wheel housing welding assembly, left and right side wall welding assembly, front wall welding assembly, top cover and front and rear crossbeam, rear baffle, left and right rear longitudinal beam and rear wheel housing welding assembly, and rear wall welding assembly.

Welding is a necessary process in modern machinery manufacturing industry, and it is widely used in automobile manufacturing. With the progress of technology, new welding technology, new materials and new methods are constantly used in automobile manufacturing. The welding problems of coated steel plate and light metal materials pose new challenges to automobile welding by polymer materials, composite materials, dissimilar materials and special materials. The robot and automation technology in the process of automobile welding make the welding face of automobile greatly changed.

In the body welding technology, the common welding principle is actually to liquefy the metal and then dissolve it together after cooling. The car body is made of four steel plates, the upper and lower four pieces of steel, and the ordinary welding is spot welding, and the steel plate is connected together through one welding point. Laser welding is to use the high temperature of laser, disrupt the molecular structure of two plates, rearrange the molecules to make the molecules in the two plates dissolve into one. So in physics, laser welding is to turn two steel plates into one plate, so it has higher strength than ordinary welding.

Direct welding equipment refers to the welding equipment that uses such equipment to make the workpiece bond together by welding. In the automobile manufacturing, the direct welding equipment includes: hanging spot welding machine, automatic welding machine, spot welding robot, arc welding robot, intermediate frequency welding machine, oil tank automatic sewing machine, fixed nut convex welding machine, stud welding machine, etc.

The assembly welding of electric resistance welding automobile body includes the assembly welding of frame, floor, side wall, door and body assembly, etc. According to statistics, there are about 3000 ~ 4000 resistance spot welding points on each car body. Spot welding technology is still in the leading position in the assembly and welding process of automobile body. The application of resistance spot welding technology has realized the mass production and automation of automobile body manufacturing.

There are three main types of resistance spot welding equipment used in automobile body assembly and welding production line, which are automobile automatic production line manufacturers

The suspension spot welder is mainly used in the positioning welder position of the body assembly and welding production line, or for the welding of parts with complex welding spot position (not suitable for automation). Manual operation, low degree of automation.

The advantages of multi spot welding machine and multi spot welding process are high production efficiency and small welding deformation. Its disadvantage is that it can not adapt to the production of a variety of models, and its flexibility is poor.

Spot welding robot spot welding robot is widely used in modern car body assembly and welding production line, which can improve the automation of assembly and welding production, reduce the labor intensity of operators, improve production efficiency and ensure welding quality. Spot welding robot is mainly used in repair welding station of body assembly and welding station of body assembly. Moreover, due to the adoption of spot welding robot, the flexible production mode of body assembly and welding is realized, that is, multi variety and small batch mixed line production.

In the assembly and welding production of automobile body, manual repair welding is mainly carried out in the main welding station of frame, floor, etc., and arc welding robot is applied in the welding station of sub assembly workpiece such as sub frame.

Spot welding, projection welding, seam welding, butt welding and arc welding are widely used in the production of automobile parts. For example: beam assembly bracket spot welding, transmission shaft balance piece projection welding, automobile fuel tank seam welding, automobile wheel continuous flash butt welding, automobile steering arm, muffler, purifier shell arc welding, etc.