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Quality Requirements for Automobile Exhaust Pipe's Welding

Views: 0     Author: Site Editor     Publish Time: 2023-06-20      Origin: Site


The automobile exhaust system is located at the chassis position, connecting the engine outlet and the atmosphere, and its main function is to discharge exhaust gas, purify exhaust gas, and reduce noise. At present, the materials used in automobile exhaust systems are mainly ferritic stainless steel. The working environment of the exhaust system is harsh, and the effects on materials are mainly manifested in three aspects: high temperature effect, corrosion effect, and mechanical effect of shock and vibration. Among them, condensate corrosion, external salt corrosion, high-temperature oxidation and high-temperature thermal fatigue are the characteristic requirements that must be considered in the design of parts and material selection; while the corrosion of welds must be controlled through the selection of materials, welding processes and welding wires.

To ensure the quality of the weld, in addition to the correct selection of welding wire, it is also crucial to improve the welding process, such as: improve the uniformity of welding; control the lower interlayer temperature of the weld, refine the weld structure, and prevent welding heat The occurrence of cracks increases the strength of the weld.

Production process and process of automobile exhaust pipe

The pipes used in automobile exhaust system parts are stainless steel welded pipes obtained by cold-rolled plates through pipe bending and welding. Therefore, welded pipes are required to have good formability and welding performance.

Most of the stainless steel welded pipes used in automobile exhaust systems have a wall thickness of less than 2.5mm, and the production mainly adopts continuous forming straight seam welding methods, including tungsten argon arc welding (TIG), high frequency resistance welding (HFW), laser welding (LBW) and their Combination welding between (HFW+LBW), etc.

In my country, due to the constraints of laser welding and high-frequency welding on equipment investment and high welding process requirements, the welding process of major welded pipe factories is mainly based on TIG welding. Therefore, the high cost of laser welding has become one of the restrictive factors for the current industry development.

Automobile exhaust pipe argon arc welding

Hangao Technology (SEKO Machinery) focuses on R&D and production of stainless steel industrial pipe welding production lines. It has more than 20 years of industry experience and a large production database. It is a manufacturer of automatic welding production lines integrating R&D, production and sales. It has rich research and customer data accumulation on automatic argon arc welding (TIG) and laser welding technology, can accurately control welding speed, has good welding protection effect, improves welding quality in an all-round way, does not generate spatter during welding, and has beautiful weld seams which is straight and smooth; welding deformation is small, thereby ensuring the quality of welded pipe forming. Our industrial precision welded pipe mill line tube rolling and forming machine is widely used in domestic and overseas markets, and has been widely recognized by customers.

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Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.

Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
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