A titanium alloy supporting ring fusion welding gas protection drag cover and protection method

A technology of gas protection and support rings, applied in the direction of welding accessories, etc., can solve the problems of bulky equipment, oxidation, and inability to guarantee product quality, and achieve the effect of stable airflow

CN107570849BActive Publication Date: 2019-09-10AECC AVIATION POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-09-10

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Abstract

The invention discloses a titanium-alloy supporting ring fusion-welding gas shield trailing cover and a shielding method. A trailing cover main body of a shield trailing cover is of a box structure and provided with an opening in the front face and an opening in the bottom face; a welding gun nozzle mounting hole is formed in the front end of the top face of the trailing cover main body, and an upper pipe with argon is arranged on the top face of the trailing cover main body; an inclined side plate is connected to the lower end of the left side face of the trailing cover main body and is inclined toward the outer side of the trailing cover main body; a web is connected to the right side face of the trailing cover main body, and a side pipe with argon is connected to the side face of the web; and the lower end of the inclined side plate and the lower end of the right side face of the inclined side plate are each of a circular arc structure which has the same curvature with the welding face of an outer circle of a supporting ring. The titanium-alloy supporting ring fusion-welding gas shield trailing cover can ensure that the heat affected area with the temperature of welding seam molten pool and parts exceeding 400 DEG C is not oxidized.
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Description

[0001]

Technical field

[0002] The invention belongs to the field of aero-engine manufacturing, and in particular relates to a titanium alloy supporting ring fusion welding gas protection drag cover and a protection method.

[0003]

Background technique

[0004] Titanium alloy has high chemical activity, not only in the molten state, it is very easy to react with nitrogen, hydrogen, oxygen and other elements in the air, but when the temperature is above 400 °C in the high-temperature solid state, it is also very easy to react with nitrogen, hydrogen, oxygen and other elements in the air. Elements such as hydrogen and oxygen undergo oxidation chemical reactions. If the titanium alloy is oxidized, the surface color will change. When the surface color is yellow, the oxide is TiO, indicating slight oxidation; when the surface color is blue, the oxide is Ti 2 o 3 , indicating serious oxidation, when the surface color is gray, the oxide is TiO 2 , indicating very severe oxida...

Examples

Embodiment

[0060] Such as figure 1 As shown, the material of the support ring is Ti230, the thickness of the butt joint is 2.4mm, the maximum height is 55mm, and the maximum profile diameter is 1043mm.

[0061] Partial gas shielding is performed on the welding process of the butt joint circumferential weld seam of the titanium alloy support ring, and the steps are as follows:

[0062] (1) Cleaning before welding:

[0063] a) Clean the fixture body 6:

[0064] Use clean gauze dipped in acetone to clean up harmful substances such as oil stains and water stains on the surface of the fixture body 6;

[0065] b) Clean up welding wire:

[0066] Polish with metallographic sandpaper to expose the metallic luster to remove the oxide film on the surface of the welding wire; and use absorbent cotton balls dipped in acetone to clean the surface of the welding wire;

[0067] c) Clean the support ring 9:

[0068] Since the support ring 9 is a machined surface, it is sufficient to clean the inner ...