A vacuum brazing method for titanium alloy pipelines

Abstract

The invention relates to the technical field of vacuum brazing, in particular to a vacuum brazing method of a titanium alloy pipeline. A welding bottom hole of an engine body is machined to be of a brazing structure with straight holes and arc faces matched, an optical fiber speculum is introduced to check the brazing line gap, vacuum welding is carried out in a vacuum furnace according to the steps from a to i, the problems that vacuum brazing soldering flux is insufficient in filling, and pipeline leakage risks exit are solved, and seal performance and reliability of vacuum brazing are improved. The brazing structure with the straight holes and arc faces matched is adopted, the titanium alloy pipeline is extruded through outer force, the titanium alloy pipeline generates the axial position, and it can be ensured that the bottom of the titanium alloy pipeline makes tight contact with the bottom of the welding bottom hole. The problem that traditional molten brazing materials easily flow into a channel of the welding bottom hole is solved, the problem that the traditional welding portion is too large in flow resistance change, and blockage risks are generated is solved, and the welding quality is improved.

Description

technical field [0001] The invention relates to the technical field of vacuum brazing, in particular to a vacuum brazing method for titanium alloy pipelines. Background technique [0002] Titanium alloys are widely used in the aerospace field due to their excellent performance and high stability, especially in the pipelines of fuel and gas in engine systems. Due to the complexity of the pipeline system, it usually requires reliable connection between dozens of pipelines and the engine body, the shape of the welding surface is complex, and the number of welds is large; in addition, due to the thin wall thickness of the pipeline, welding with a large thermal effect such as argon arc welding is used Method Due to the high thermal stress, it is easy to cause the hidden danger of stress cracking at the weld or the pipe wall; similarly, due to mutual shielding and interference between the pipes, vacuum electron beam welding or laser welding methods cannot be used. Since vacuum br...

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Problems solved by technology

[0003] In general vacuum brazing, it is difficult to ensure the welding gap, and there is uneven brazing material adhesion, resulting in insufficient solder filling after welding, resulting in the risk of pipeline leakage; at the same time, due to the lack of tight fit between the pipeline and the bottom hole, the brazing material melts After that, it flows into the inside of the engine flow channel through the submerged channel, resulting in an increase in the flow resistance of the engine flow channel, or even the risk of blockage; the above two risks will pose a serious threat to the normal operation of the engine, and urgently need to take measures to solve them

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