Electron beam welding method of thin-walled casing gas-collecting hood structure

Abstract

The invention provides an electron beam welding method of a thin-walled casing gas-collecting hood structure, and belongs to the technical field of gas-collecting hood welding. The electron beam welding method comprises the following steps of: step 1, designing a welding structure; step 2, performing the single-piece processing of a gas-collecting hood 1; and step 3, welding the gas-collecting hood 1. A gas-collecting hood heat shaping fixture in step 2. 6 comprises a tire 5, a pressure ring 6, pins 7, wedge blocks 8, and a hanger 9, wherein the hanger 9 is welded on the inner surface of the tire 5; the pressure ring 6 is arranged on the top of the tire 5; the wedge blocks 8 are uniformly arranged on the top of the pressure ring 6 in the circumferential direction and are in one-to-one correspondence with through holes of the pressure ring 6; and the pins 7 sequentially pass through the wedge blocks 8 and the pressure ring 6 to fix the pressure ring 6 and the tire 5. The electron beam welding method reduces the welding residual stress and the welding deformation, and improves the quality of parts through the design of the welding structure, the design and process improvement of thegas-collecting hood heat shaping fixture, and the improvement of the welding process.

Description

Technical field [0001] The invention belongs to the technical field of gas collecting hood welding, and particularly relates to an electron beam welding method for a thin-walled casing gas collecting hood structure. Background technique [0002] The thin-walled casing is welded by the inner ring, outer ring, support plate, gas collecting hood, mounting seat and other parts. There are many welds and large deformation, especially in the gas collecting hood. The gas collecting hood and the outer ring pass through two parts. The length of the two circumferential welds is 2.934m and 3.045m respectively. The existing welding is usually carried out by argon arc welding. For the structural parts of the large thin-walled titanium alloy casing, argon arc welding is used. Long welding seam length, very large deformation, serious size tolerance, large residual stress, poor welding protection effect, seriously affecting the quality of parts. Summary of the invention [0003] The invention rea...

AI Technical Summary

Problems solved by technology

[0002] The thin-walled casing is welded by inner ring, outer ring, support plate, gas collecting hood, mounting seat and other parts. The number of welds is large and the deformation is large, especially in the gas collecting hood. The lengths of the two girth welds are 2.934m and 3.045m respectively. At present, argon arc welding is usually used for welding. For titanium alloy large thin-walled casing structural parts, argon arc welding is used. The length of the weld is long, the deformation is very large, the size is seriously out of tolerance, the residual stress is large, and the welding protection effect is not good, which seriously affects the quality of the parts

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