Method for repairing high-temperature alloy thin-walled cartridge receiver part through precision pulse welding

Abstract

The invention relates to a method for repairing a high-temperature alloy thin-walled cartridge receiver part through precision pulse welding. The method comprises the following steps: according to the length and position of the flaw of the thin-walled cartridge receiver part, analyzing the failure mode and the stress state of the part in combination with a numerical simulation technique; before welding, carrying out precision measurement on the front and rear mounting edges and other related sizes of a cartridge receiver; determining the position and size of the flaw by using X-ray examination and dyeing examination; carrying out pre-welding technical preparation; adopting a special welding protecting tool according to the position to be repaired; in combination with the failure mode and the stress state of the part, on account of the position and the size of the flaw, determining a single pulse or continuous pulse mode, welding technical parameters and welding order technical factors so as to reduce the stress level of the part after welding; and carrying out welding by a welding repairing technology determined in the above step. The method has the advantages that the weld joint performance reaches more than 90% of base metal performance, and standard requirements are met; and after welding, the radial run-out of the inner and outer mounting edges of the cartridge receiver is smaller than 0.08mm, the end surface run-out is smaller than 0.10mm, and assembling requirements are met.

Description

technical field [0001] The invention relates to the technical field of aero-engine manufacturing, in particular to a method for repairing superalloy thin-wall casing parts by precision pulse welding. Background technique [0002] After a life cycle of high-temperature alloy sheet metal welding casing, due to high-temperature gas, it is exposed to thermal stress, vibration and high-temperature environment for a long time. At the same time, it is also affected by factors such as stress release during the manufacturing process, which eventually leads to its Defects such as cracks often appear at the support plate. At present, the failure rate of casing parts is about 70%. [0003] Before the repair, the casing parts are already in the final dimensional accuracy state. Due to the large heat input of the conventional TIG welding repair process, the energy is not easy to control stably, etc., the thin-walled casing parts will have large deformation after welding, which cannot meet...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the assembly accuracy of the thin-walled casing parts is relatively high. Due to the non-concentration of the welding arc, the parts after welding are deformed and cannot meet the repair requirements of the parts. The technical problem to be solved by the present invention is to provide a A method for repairing superalloy thin-wall casing parts by precision pulse welding that can meet the performance and dimensional accuracy requirements after welding and repairing parts

Images