Auto welding welding technology

　　Welding is the use of various forms of energy so that processed materials produce permanent connection of a molding method. Welding can greatly small, in the small spell big, especially suitable for manufacturing large metal structure and machine parts; Combined welding technology, such as casting, forging, can be used to simplify the forming process of complex parts, easy to realize mechanization and automation. Welding technology especially in the car and so on are widely used in machinery industry.

Car white body, engine and gearbox are dependent on the application of welding technology. Relying mainly on "steel structure" in the automobile body welding processing, auto welding is different from other product requirements:

　 1. High accuracy requirement of the size of product. In order to ensure the accuracy of the product assembly and dimensional stability, request as far as possible to reduce the precision of the lamella piece before welding deviation and the thermal stress and deformation after welding.

  2. The demand is high, on the performance of the weld joint of welded joint is not only to satisfy the static and dynamic mechanical performance index, and has a strict low cycle fatigue performance requirements.

  3. Requirements for batch welding production of high quality and good consistency.

  4. High rhythm, high efficiency of the welding production process requirements.

  5. The "zero defect" quality control and assurance, puts forward the automatic welding process monitoring and information management requirements.

　　In recent years, the automotive industry in the new welding technology, applications of new type of flexible combination jig and promotion has played a positive role in promoting. In automotive products "lighter, safer, better performance and lower cost" development goals, the current auto welding technology is the traditional material connected to the concept and method on the basis of the rapid extension and expansion, and advanced the direction of "fine quantitative welding manufacturing".

Car engine, gearbox, axle, frame, body, carriage of six cannot leave the application of welding technology in automotive components manufacturing, welding, projection welding, seam welding, roll points (convex) CO ₂ gas protection welding, welding rod arc welding, welding, argon arc welding, gas welding, brazing, friction welding, electron beam welding and laser welding and other welding methods, the result of spot welding, gas shielded welding, brazing with large quantity, high degree of automation, high speed, low consumption, the characteristics of the welding deformation is small, easy to operate, so the sheet cover parts of the car body is especially suitable for, as a result, most used in automobile production. Spot welding in the investment costs accounted for about 75%, other welding method is just 25%.

Behind the body welding jig quality directly decides the working procedure, the quality of the automobile body assembly quality bad, not only affects the vehicle appearance, can also lead to leak rain, wind, road noise and the door closed, so the welding should cause enough attention. In the automotive industry, the welding is a key for production of automobile parts and automobile body link, plays a special role, which forms a connecting link between the preceding and at the same time, the models of numerous, forming a complex structure and parts production specialization, standardization, and car manufacturing in terms of quality, efficiency and cost of comprehensive requirement, decide the automobile welding processing is a multidisciplinary, interdisciplinary and technology integration of the production process. At present in the production of auto parts and white body, the main welding method has the CO ₂ gas protection welding and resistance spot welding, laser welding, but there are also using argon arc welding, electron beam welding, friction welding, intermediate frequency welding technology and so on.