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Vacuum electron beam welding method for refractory alloy

A vacuum electron beam and refractory alloy technology, which is applied in vacuum electron beam welding of Nb521 niobium alloy and vacuum electron beam welding of refractory alloy, can solve the problems that niobium alloy is easily contaminated by impurities, and achieve stable welding performance, high density, Good effect of high temperature performance

Inactive Publication Date: 2017-02-15
BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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Problems solved by technology

[0003] The purpose of the present invention is to provide a vacuum electron beam welding method for refractory alloys, which solves the problem of welding defects of refractory alloys; also solves the problem that niobium alloys are easily contaminated by impurities

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  • Vacuum electron beam welding method for refractory alloy

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Embodiment Construction

[0012] In order to make the purpose, contents and advantages of the present invention clearer, the specific implementation manners of the present invention will be further described in detail below in conjunction with the examples.

[0013] The refractory alloy of the present invention adopts Nb521 niobium alloy as an embodiment, and the specification of the Nb521 niobium alloy test piece is 200mm * 60mm * 12mm, and a kind of refractory alloy vacuum electron beam welding method of the present invention comprises the following steps:

[0014] The first step: Welding surface treatment: use mechanical processing methods to process all the welding surfaces of the samples to be welded to ensure that the maximum allowable surface roughness Ra is 3.2μm, and the butt joint surface is smooth, smooth, and free of burrs, and maintain edges and corners;

[0015] Step 2: Preparation before welding: pickle the test piece to be welded, rinse it with clean water after pickling, and then dry i...

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Abstract

The invention discloses a vacuum electron beam welding method for refractory alloy. The vacuum electron beam welding method for refractory alloy specifically comprises the steps of treatment of a weld face, preparation before welding, assembling, electron beam welding, and quality checking after welding. The vacuum electron beam welding method for refractory alloy has the characteristics that a vacuum electron beam welding environment is utilized, the penetrability is high, energy is centralized, and heat input is small; Nb521 niobium alloy with the thickness being 12 mm can be welded, and the welding performance is stable. Formation of a weld joint after welding is good, defects including cracks, air holes, pits, undercuts, weld lumps and the like of the surface of the weld joint are avoided, the internal welding quality is good, all normal-temperature mechanical properties can meet the national military standard requirements, and the high-temperature performance is good.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a vacuum electron beam welding method for refractory alloys, in particular to a vacuum electron beam welding method for Nb521 niobium alloy. Background technique [0002] Nowadays, with the development of aerospace technology, it is required to continuously improve the heat resistance of cabin materials. Nb521 niobium alloy has a high service temperature (≥1400°C), has good high-temperature mechanical properties, and can meet the use requirements of special compartments. However, due to the high melting point of niobium alloy (2460 ° C), it is a refractory metal, and its welding performance is worse than that of pure niobium. It is easy to oxidize and nitride at high temperatures, resulting in welding cracks and embrittlement of weld metal and heat-affected zone. In addition, because niobium is very active at high temperatures and is sensitive to the intrusion of im...

Claims

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Application Information

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IPC IPC(8): B23K15/06
CPCB23K15/06B23K2103/08
Inventor 朱冬妹陈建勋王瑞李康宁马向宇姜涛高丽娇
Owner BEIJING XINGHANG MECHANICAL ELECTRICAL EQUIP
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