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

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.

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...

AI Technical Summary

Problems solved by technology

During the processing of the outer circular butt girth weld, not only the oxidation phenomenon occurs in the outer circular butt girth weld and the heat affected zone of the weld, but also because the outer surface of the support ring is only 5mm away from the weld, during the welding process, near the arc column, The outer side of the support ring is close to the molten pool of the weld. Due to the high temperature, if there is no argon protection or improper protection, oxidation has already occurred before entering the protection area, making the protection measures ineffective.

Therefore, the use of the traditional local gas protection tow cover can only solve the problem that some heat-affected areas with a temperature above 400°C will not be oxidized, and the heat-affected area on the outer side of the support ring still has oxidation, which cannot guarantee product quality, so it cannot be used.

The overall protection method of the traditional argon-filled box is affected by the structure of the support ring. The maximum outer diameter of the support ring is 1043mm, and a large-scale argon-filled box is required for overall protection, which makes the equipment huge and expensive.

Therefore, this option is not

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