Inner expansion positioning welding central spindle

Abstract

The invention belongs to the technical field of aerospace manufacturing, and particularly discloses an inner expansion positioning welding central spindle. The inner expansion positioning welding central spindle comprises a tension bar, an elastic expansion device and a limiting device. A lug is machined on the tension bar. The elastic expansion device is arranged outside the lug. The limiting device is fixedly arranged outside the middle part of the tension bar. The inner expansion positioning welding central spindle further comprises a rotary moving structure arranged at one side of the tension bar. The welding central spindle has an expansion and contraction function. In the welding process, the tension bar can be adjusted through an adjusting nut, radial-direction expansion of an inner bracing structure is realized so that a pipe and a joint can be fixed, and the pipe and the joint are located on the same axis; angular deformation of the pipe and the joint due to welding high temperatures is avoided, the phenomenon that the welding position of the joint is molten due to overtemperature in the welding process, strength is lowered and thus the welded joint is disengaged can be prevented, repeated arc starting and suppressing can be avoided, continuous welding of welding seams is achieved, and the welding percent of pass is increased.

Description

Technical field [0001] The invention belongs to the technical field of aerospace manufacturing, and in particular relates to an internal expansion and positioning welding mandrel for welding small φ8-φ14 aluminum alloy tubes. Background technique [0002] The booster delivery system for space launch vehicles and engines includes a variety of small-diameter aluminum alloy thin-walled ducts, such as valve controller ducts, small engine ducts, nitrogen controller ducts, pre-cooling return pipes and so on. The pipe material is usually 5A06 aluminum alloy, the specifications are φ8, φ10, φ12, φ14, φ16, φ20, etc., and the wall thickness is 1mm. [0003] Among them, the φ8-φ14 aluminum alloy conduit is the most difficult to weld. Due to the low high temperature strength of aluminum alloy, the softening of the welded joint during the welding process is likely to cause angular deformation between the pipe and the joint. Especially for pipeline products with welded aluminum alloy diameter l...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an internal stretching and positioning welding mandrel, which has the functions of stretching, fixing and shrinking, and can solve the problem that the small-diameter aluminum alloy conduit joint is easy to soften and cause angular deformation or fall off, while avoiding segmental welding, and improving the performance of the conduit. Welding pass rate

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