The automobile body welding process is mainly to press the formed body part of the thin plate structure on the basis of the accurate positioning of the fixture, according to the welding process from the small assembly, the large assembly to the body assembly, at the workpiece lap joint The electric resistance is used to melt the metal to form a solder joint, and the weldment is integrated to form a qualified body. Medium frequency welding of a commercial vehicle Automated Nucleic Acid Extractor Automated Nucleic Acid Extractor,Purification Nucleic Acid Extractor,Nucleic Acid Extractor,Automatic Dna/Rna Purification System Guangzhou Baybio Bio-tech Co., Ltd , https://www.gzbaybio.com
More than 90% of the car body welding process is spot welding. Generally, the welding point of a car body is between 3 500 and 5000. Spot welding is a kind of electric resistance welding. It has the characteristics of internal heat source, heat concentration, small heat affected zone, small product deformation, good surface processing quality, easy operation, no use of welding consumables, etc. One of the most common methods for stable quality, high production efficiency, and easy automated mass production.
There are two main types of spot welders commonly used in automobile bodies: ordinary spot welders and spot welding robots. The ordinary spot welding machine is mainly a suspension integrated spot welding machine, which is used for welding small assemblies and sub-assemblies. The robot is mainly used for the welding of automated production lines, capable of complex process operations, adapting to harsh working environments, replacing bulky, monotonous, and repetitive artificial labor, with high flexibility, high beat, high quality, high energy efficiency and high precision. Performance, especially suitable for new product development and multi-variety production needs, product change type is fast, short cycle, strong strain capacity.
The rapid development of automotive products puts higher demands on welding equipment, mainly in three aspects:
(1) Precise welding parameters Control welding current, welding time, welding pressure and electrode wear state are directly related to the quality of welding. The welding controller achieves the purpose of ensuring stable welding quality by precisely controlling the welding parameters. Imported equipment should be more precise in the control of welding parameters, such as medium frequency inverter welding technology (see photo), adaptive welding technology RAFT, etc.; foreign intermediate frequency inverter technology is quite mature, Germany BOSCH, US MEDAR, Japan MIYACHI and other companies There are reliable control power supplies to the Chinese market. The development of domestic intermediate frequency inverter power supply is still quite different from foreign products due to the quality of power components and manufacturing processes. 
(2) Good process operation performance is in the aspects of welding process accessibility and ergonomics. Analyze through 3D simulation and select the appropriate type of welding torch based on the product structure. Through the modularized and standardized design of the structural parts of the welding torch, the weight of the welding torch is reduced, the production cycle is shortened, the universal interchangeability of components is improved, the spare parts are reduced, and the maintenance is simple.
(3) Good cost performance, quality and cost are always the unity of contradiction. High-quality welding processes and equipment will inevitably bring about an increase in welding costs. How to balance quality and cost through reasonable choices is put on the agenda. The medium frequency inverter welding technology has higher welding control precision, welding quality, smaller transformer volume quality and lower energy consumption, but a fixed investment is higher, and the cost per unit of ordinary power frequency equipment is increased by 50,000-100,000 yuan. Considering its excellent energy-saving effect (single point cost reduction) and faster welding speed (significantly reducing the number of robots and stations), reducing operating costs, it is more suitable for high-beat, highly flexible production lines.
If the domestic IF inverter technology can make a breakthrough and solve the embarrassing situation of the import of key components, it can further reduce the investment in fixed assets and improve the cost performance.
Three requirements for welding equipment for welding equipment