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Electron beam welding method of adding transition layer into compound between metals of titanium aluminium alloy

An intermetallic compound and electron beam welding technology, which is applied in electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of low mechanical strength of welded joints and easy cracks in joints

Inactive Publication Date: 2008-01-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the existing problems in the welding of titanium-aluminum (TiAl) alloys, which require ultra-high temperature preheating before welding, cracks are easily generated inside the joint, heat treatment is required after welding, and the mechanical strength of the welded joint is low, and further provides a Electron beam welding method of titanium-aluminum alloy intermetallic compound with transition layer

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  • Electron beam welding method of adding transition layer into compound between metals of titanium aluminium alloy

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specific Embodiment approach 1

[0005] Specific embodiment 1: This embodiment is described in conjunction with FIG. 1. Its welding method steps are: a. Perform heat treatment for stress relief before welding the titanium-aluminum alloy to be welded. The heating temperature is 600 ° C to 700 ° C, and the holding time is 1.5 h~3h; b. Physically and chemically clean the surface of the welding part of the titanium-aluminum alloy to be welded and the surface of the metal foil. The thickness of the metal foil is 30 μm to 1000 μm; c. Set the metal foil between the welds, and clamping; d, in a vacuum of 5 × 10 -2 Pa~5×10 -4 Under the condition of Pa, use the electron beam to scan and preheat the weld seam or defocus the preheating, the number of preheating times is 1 to 4 times; e, the vacuum degree is 5×10 -2 Pa~5×10 -4 Under the condition of Pa, the welding seam is micro-alloyed with an electron beam with a focusing current of 2500mA-2700mA, an accelerating voltage of 40kV-60kV, and an accelerating current of 10...

specific Embodiment approach 2

[0006] Embodiment 2: In the step b of the welding method described in Embodiment 1, the chemical composition of the metal foil is composed of one or more of titanium and β-phase stabilizing elements; the above-mentioned β-phase stabilizing elements include molybdenum, molybdenum, Chromium, vanadium, niobium or manganese.

specific Embodiment approach 3

[0007] Embodiment 3: In step d of the welding method described in Embodiment 1, the scanning waveform of the electron beam scanning preheating is a symmetrical waveform. The scanning waveform of electron beam scanning preheating can be selected as square wave or sine wave.

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Abstract

An electronic beam welding method of Ti-Al alloy by adding transmission layer to generate intermetallic compound includes thermally treating the Ti-Al alloy to be welded for eliminating stress, chemically and physically cleaning the surfaces of TiAl alloy and metallic foil, filling the metallic foil in the seam to be welded, preheating by electronic beam, microalloying by electronic beam, and natural cooling.

Description

Technical field: [0001] The invention relates to the technical field of welding of titanium-aluminum alloy intermetallic compounds. Background technique: [0002] The metal bonds and covalent bonds in the existing titanium-aluminum (TiAl) alloy crystals coexist, so that it has both the strength of metal and the high-temperature performance of ceramics, and thus produces high specific strength, specific modulus, and good oxidation resistance. , creep resistance, etc. These advantages make it a good application prospect as a heat-resistant structural material for aero-engines and automobiles. The successful application of such alloys to actual production will inevitably involve the secondary processing of the alloy (such as weldability). From the current research status, it can be seen that the connection of titanium-aluminum intermetallic compound itself and the connection with other metals are mainly based on solid phase connection. Although brazing and diffusion welding h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/06B23K15/00
Inventor 冯吉才吴会强何景山张秉刚何鹏
Owner HARBIN INST OF TECH
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