Installing and welding method for multilayer thin-wall welded casing with large height-diameter ratio

Abstract

The invention discloses an installing and welding method for a multilayer thin-wall welded casing with a large height-diameter ratio. The installing and welding method comprises the following steps that 1, according to the structure of a welded casing, a segmented installing and welding scheme is determined; 2, welding shrinkage allowance is additionally arranged on a welded part subjected to installing and welding; 3, according to the segmented installing and welding scheme in the step 1, a technological installation edge and a technological spigot are arranged at the welding position of the welded part; 4, welding machining is conducted according to the segmented installing and welding scheme in the step 1; 5, the welded part subjected to welding machining is checked, and correcting deformation is conducted; 6, a process installing edge on the welded part is removed after the welding machining; and 7, the step 4 to the step 6 are circularly carried out, and the welding machining of the large-height-diameter-ratio multi-layer thin-wall welded casing is completed. By means of a segmented installing and welding design on the structure of the welded casing, the installing and welding difficulty is lowered, welding deformation can be corrected step by step when all parts are installled and welded, and the sizes and the shape and position relation of all layers in all layers are corrected in a staged mode.

Description

technical field [0001] The invention belongs to the technical field of aero-engines, in particular to a large-height-diameter-ratio multilayer thin-wall welding casing welding method. Background technique [0002] The characteristics of multi-layer thin-wall welded casing with large height-to-diameter ratio are that there are many layers of parts to be assembled and welded, the height / diameter ratio is large, the wall thickness of the main body is thin, and the welding is easy to deform. In order to achieve one-time assembly and welding, and ensure the axial dimensions and concentricity of each layer of parts, at the same time, it is necessary to ensure that the assembly requirements such as the gap and misalignment of each joint are within the acceptable range. Due to the limitation of the operating space, the assembly is very difficult, and the requirements for the parts of each layer are too strict, and the manufacturing cost is doubled. The most important thing is that e...

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Problems solved by technology

By searching "multi-layer thin-wall welding casing", there is one related patent, patent name: multi-layer structure thin-wall welding casing deformation control method and fixture, application number: CN201711367762.5, this patent proposes a support casing Argon-arc welding deformation control method and fixture, and this patent is aimed at the high-height-to-diameter ratio multi-layer ring component welding method, and does not involve argon arc welding deformation control method and fixture

[0003] To sum up, the welding method of multi-layer thin-walled welding casing with large height-to-diameter ratio in the prior art is difficult to assemble, and it is difficult to control the shrinkage and deformation in all directions after welding, which makes it difficult to guarantee the size and shape relationship, and the manufacturing cost is high. question

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