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Electron beam welding method of titanium alloy material and CVDNb

A technology of electron beam welding and titanium alloy, applied in electron beam welding equipment, welding equipment, arc welding equipment, etc., can solve the problems of poor welding seam formation, unstable welding, and excessive pores.

Active Publication Date: 2016-02-03
SHANGHAI INST OF SPACE PROPULSION
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of unstable welding, poor weld formation and excessive pores in the welding process of titanium alloy and CVDNb, and provide a method for electron beam welding of titanium alloy and CVDNb with good shape, dense interface and no pores

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  • Electron beam welding method of titanium alloy material and CVDNb

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be pointed out that for those of ordinary skill in the art, a number of modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0017] Such as figure 1 As shown, the TC4 ring test piece 1 and the CVDNb ring test piece 3 with the graphite matrix 2 in the embodiment of the present invention are electron beam welded by the lock bottom butt method, the weld diameter is 76mm, the lock bottom length is 1mm, and the lock bottom reaches The surface distance of the weld is 2.5mm, and the inner diameter of the CVDNb connecting ring is 60mm.

[0018] The embodiment of the present invention provides an electro...

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Abstract

The invention discloses an electron beam welding method of a titanium alloy material and CVDNb. The electron beam welding method comprises the following steps: performing oil removal, acid pickling and drying on faces to be welded of a TC4 annular test piece and a CVDNb annular test piece with a graphite matrix; butting the TC4 annular test piece with one face, having the graphite matrix, of the CVDNb annular test piece, and fixing the two abutted test pieces on a fixture; fixing the pieces to be welded by using a three-jaw chuck within a vacuum chamber of an electron-beam welding machine and adjusting the periphery and end faces of a weld joint; preheating one side of the CVDNb annular test piece by means of suppositional focus welding; and welding one side of the TC4 annular test piece by means of substantial focus welding. According to the electron beam welding method, an electron beam is applied to act on a TC4 parent metal and a CVDNb less-melting or not-melting is adopted, and a TC4 liquid metal is brazed with a preheated CVDNb parent metal to realize connection; as a result, such defects as easy splashing, pores, poor formation and the like due to that the electron beam directly acts on loose CVDNb are avoided.

Description

Technical field [0001] The invention belongs to the field of welding dissimilar refractory metals, in particular to an electron beam welding method of titanium alloy material and CVDNb. Background technique [0002] With the development of aerospace technology, the operating temperature of advanced aerospace engine nozzles continues to increase, and at the same time, the weight needs to be continuously reduced. The C / SiC composite nozzle has the advantages of low density, high temperature resistance, oxidation resistance, and ablation resistance, which can make up for the large weight of traditional niobium alloys. Titanium and titanium alloys are widely used in aerospace engine heads due to their high specific strength, excellent corrosion resistance and good low-temperature impact toughness. However, it is difficult to weld the C / SiC composite nozzle and the titanium alloy head together. If chemical vapor deposition is used, a CVDNb connecting ring is prepared on the end of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K15/04B23K103/18
CPCB23K9/167B23K15/0033B23K15/04B23K2103/18
Inventor 潘攀刘彦杰刘俊杰潘宏辉黄陈师饶庆庆陈晓江
Owner SHANGHAI INST OF SPACE PROPULSION
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