Process for welding exhaust manifolds and flange

Abstract

The invention belongs to the technical field of special welding, and particularly relates to a process for welding exhaust manifolds and a flange. The process includes the following steps that the gas inlet flange is pre-treated, particularly, a raw material of the gas inlet flange is treated, so that the roughness of a mounting face of the gas inlet flange is not larger than 0.8 <um>m, and the planeness of the mounting face of the gas inlet flange is not larger than 0.1 mm; the gas inlet flange is transported, particularly, the treated gas inlet flange is conveyed through a special circulating cart, and the mounting face of the gas inlet flange is prevented from being damaged; the gas inlet flange is fixed through an oil pressure valve welding jig; and welding is carried out according to a certain welding sequence. By means of the process for welding the exhaust manifolds and the flange, the operation steps can be simplified, and the effect that the gas inlet flange meets the requirements for the planeness and the roughness of the mounting face after being welded is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of special welding, and in particular relates to a welding process of an exhaust manifold and a flange. Background technique [0002] Automobile has become a popular means of transportation, and its market competition is increasingly fierce. With the enhancement of environmental protection awareness, the quality of automobile exhaust purification function has become one of the criteria for people to choose. The exhaust manifold is an important component of the engine. It is used to bring the exhaust gas of each cylinder into the manifold through the manifold, and then use the three-way catalytic converter to convert the exhausted harmful gases such as CO, HC and NOx into harmless gases through oxidation and reduction. Harmful carbon dioxide, water and nitrogen. In the prior art, the three-way catalytic converter is directly connected to the exhaust manifold to form a tightly-coupled integrated structure, so...

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Problems solved by technology

[0005] In the prior art, in order to avoid air leakage, the mounting surface of the intake flange needs to be milled after welding with the exhaust manifold, but the milling process takes a long time and the milling fixture will be mixed with welding slag, resulting in After milling, the product cannot achieve the expected effect, which affects the production pass rate of the entire product

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