Method and device for plasticizing joint of automobile pipe fittings

Abstract

The invention provides a joint plasticizing method and device for automobile pipe fittings, wherein the method comprises: step 1: through a pipe rolling mechanism, rolling a thin plate into a straight cylinder step by step in a cold working rolling method to form a pipe fitting to be welded; step 2 : Use double laser beams to irradiate vertically above the butt joint of the pipe fittings to be welded to implement the welding-fusion process; the front laser beam is used to weld the pipe fittings, and the rear laser beam is used to implement the fusion treatment of the welding seam, and finally the welding-fusion process is formed. The pipe fittings are fused; the double laser beams are on the same vertical plane as the slits of the pipe fittings to be welded. The method of the invention not only increases the plasticity of the pipe fittings and solves the problem of cracking of the welds processed from the welded pipe fittings to the special-shaped pipe fittings, but also provides the device with the function of rounding the pipe fittings to be welded.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a joint plasticizing method and device for automobile pipe fittings. Background technique [0002] The automobile exhaust system starts from the side close to the engine and consists of exhaust manifold, front pipe, flexible pipe, catalytic converter, front muffler, middle pipe, main muffler and tail pipe. The ambient temperature of the high temperature end of the exhaust system, such as the manifold and the front pipe, is as high as 750~900 °C, and even locally can reach 950 °C, which requires extremely high material performance. [0003] Ferritic stainless steel generally does not contain nickel, and has the characteristics of large thermal conductivity, small expansion coefficient, good oxidation resistance, and excellent stress corrosion resistance. Excellent material for the manufacture of automotive piping systems. However, the welded pipe is prone to po...

AI Technical Summary

Problems solved by technology

[0008] The weld seam plasticity of the welded pipe fittings in the prior art is poor, and the weld seam is easy to crack when spinning forming, internal high pressure forming and other methods are used to manufacture special-shaped pipe fitting products, and there are disadvantages such as low production efficiency and low product qualification rate.

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