Auxiliary device and welding method for precision argon arc welding of elastic collar

Abstract

The invention discloses an auxiliary device for precision argon arc welding of an elastic clamping ring and a welding method of the auxiliary device applied to welding beads with small size. The auxiliary device for the precision argon arc welding of the elastic clamping ring adopts a welding process design added with an arc striking plate and an arc stopping plate, used in combination with the welding fixture of a long-ring shaped gas lens type rectification mechanism as the auxiliary device. A set cushion block comprises a multiple layers of nickel nets arranged between an upper cushion block and a lower cushion block, and the lower cushion block is provided with a rectifying plate; the set rectification mechanism rectifies protective gas and converts the cluttered turbulent state of the protective gas into the relatively regular laminar state, so as to protect welded joints in the manner of stable laminar state, and simultaneously prevent connection parts between the arc striking plate and weldment and between the arc stopping plate and weldment and avoid the welding beads being polluted by external impurities.

Description

technical field [0001] The invention discloses a welding method, in particular to an auxiliary device for precision argon arc welding of an elastic collar and a welding method thereof, which are applied to narrow and small-sized welding seams. Background technique [0002] Aeroengine high-pressure compressor elastic collar, the thickness of the elastic collar material is 1.1mm, the length of the welded part is 3.6mm, the size of the weld is relatively narrow, the welding method used is argon tungsten arc welding, class II weld , the welding process of the existing technology often has welding defects such as burning at the end of the weld and incomplete penetration of the main part of the weld. The collar fracture accident, so strict requirements are put forward for the quality of the elastic collar. It is manufactured according to the Class I weld. Repair welding is not allowed for defects exceeding the welding standards, and the elastic collar that is welded to a high stan...

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Problems solved by technology

[0002] Aeroengine high-pressure compressor elastic collar, the thickness of the elastic collar material is 1.1mm, the length of the welded part is 3.6mm, the size of the weld is relatively narrow, the welding method used is argon tungsten arc welding, class II weld , the welding process of the existing technology often has welding defects such as burning at the end of the weld and incomplete penetration of the main part of the weld. The collar fracture accident, so strict requirements are put forward for the quality of the elastic collar. It is manufactured according to the Class I weld. Repair welding is not allowed for defects exceeding the welding standards, and the high-standard welded elastic collar, The pass rate is only 50%, which seriously restricts the delivery of the engine. The reason for the failure of the elastic collar is analyzed. The main reason is that the welding quality is not good enough. Among them, the design of the tooling structure is unreasonable, and the argon gas protection effect on the welding seam is poor during the welding process. The quality of weld formation is not high. In order to ensure the smooth completion of the factory's production tasks, and to reduce the number of parts rework and reduce unnecessary quality loss in the factory, it is necessary to improve the manufacturing quality of the elastic collar and re-design the process to increase the pass rate.

[0003] Due to the narrow structural size of the argon arc welding part of the elastic collar, limited by the characteristics of the welding equipment, the time for the arc starting, stable combustion and arc closing of the welding arc is extremely short, which may easily cause burning and damage at the end of the weld. Welding defects such as incomplete penetration of the main part of the weld, the pass rate of the weld is extremely low, and the repaired product is prone to weld fracture failure during work, causing a great safety hazard to the normal operation of the product

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