Laser-induced monotectic and isomorphous reaction welding method for titanium-nickel heterogenic joint

A technology of laser induction and welding method, used in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of brittle fracture of welded joints, poor plasticity of welds, differences in thermophysical properties, etc., and achieve good The effect of high mechanical properties and weld interface bonding

Active Publication Date: 2018-04-20
BAOJI UNIV OF ARTS & SCI
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  • Description
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  • Application Information

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Problems solved by technology

[0005] However, since titanium and nickel have significant differences in thermophysical properties such as chemical composition, melting point, thermal conductivity, linear expansion coefficient, and specific heat capacity, and it is easy to form Ti during welding. 2 Ni, TiNi 3 and other intermetallic compounds, resulting in the formation of cracks in welded joints and brittle fracture, and compared with copper metal and other metals, the properties of nickel metal are different, so the inventor adopts such as adopting niobium as the intermediate layer to weld according to the above-mentioned disclosed method, and finds that although The joints are welded together, but its strength is only less than 150MPa, the elongation is 1.5%, and the plasticity of the weld is poor

Method used

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  • Laser-induced monotectic and isomorphous reaction welding method for titanium-nickel heterogenic joint
  • Laser-induced monotectic and isomorphous reaction welding method for titanium-nickel heterogenic joint
  • Laser-induced monotectic and isomorphous reaction welding method for titanium-nickel heterogenic joint

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Embodiment 1

[0029] In order to obtain titanium-nickel heterogeneous joints, pulse laser welding is performed on TC4 titanium alloy and Inconel 718, in which the TC4 titanium alloy plate is the same size as the Inconel 718 plate, which is 100mm (length) × 50mm (width) × 1.0mm (thickness) ), put the niobium and Cu interlayer solder between the interface between the TC4 titanium alloy plate and the Inconel 718 test plate to ensure that there is no gap between the interfaces of Ti / Nb, Nb / Cu and Cu / Ni interfaces, and the width of the niobium interlayer solder is 1.0mm, the width of the Cu interlayer solder is 50μm, the pulse laser spot is placed at a distance from the Ti / Nb interface, and the pulse laser welding is performed under the double-sided argon protective atmosphere, such as figure 1 and figure 2 As shown, the melting is controlled in the area near the Ti / Nb interface, and the Nb foil near the Cu side does not melt. Relying on the heat provided by the heat conduction from the molten ...

Embodiment 2

[0034]In order to obtain titanium-nickel heterogeneous joints, TC4 titanium alloy and Inconel 718 are pulsed laser welded, and the TC4 titanium alloy plate is the same size as the Inconel 718 plate, which is 100mm (length) × 50mm (width) × 1.0mm (thick), place the niobium and copper interlayer solder between the interface of the TC4 titanium alloy plate and the Inconel 718 plate to ensure that there is no gap between the Ti / Nb, Nb / Cu and Cu / Ni interfaces, and the width of the niobium interlayer solder The thickness of the Cu interlayer solder is 0.8mm, and the thickness of the Cu interlayer solder is 30μm. The pulse laser spot is placed at a distance of 0.2mm from the Ti / Nb interface close to the Ti side, and the pulse laser welding is performed under the double-sided argon protective atmosphere. The pulse laser welding process parameters are: laser peak value The power is 1.7kW, the pulse width is 20ms, the pulse frequency is 40Hz, the welding speed is 600mm / min, the defocus i...

Embodiment 3

[0038] In order to obtain titanium-nickel heterogeneous joints, TC4 titanium alloy and Inconel 718 were pulsed laser welded, and the TC4 titanium alloy plate was the same size as the Inconel 718 plate, which was 100mm (length) × 50mm (width) × 1.0mm ( Thick), put the niobium and copper interlayer solder between the TC4 titanium alloy plate and the interface with the Inconel 718 plate to ensure that there is no gap between the Ti / Nb, Nb / Cu and Cu / Ni interfaces, and the width of the niobium interlayer solder The thickness of the Cu interlayer solder is 0.9mm, and the thickness of the Cu interlayer solder is 40μm. The pulse laser spot is placed at a distance of 0.2mm from the Ti / Nb interface close to the Nb side, and the pulse laser welding is performed under the double-sided argon protective atmosphere. The pulse laser welding process parameters are: laser peak value The power is 1.6kW, the pulse width is 15ms, the pulse frequency is 50Hz, the welding speed is 800mm / min, the defo...

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Abstract

The invention discloses a laser-induced monotectic and isomorphous reaction welding method for a titanium-nickel heterogenic joint. According to the method, two layers of composite interlayer solder are added between a titanium material and a nickel material, niobium metal serves as the first layer of composite interlayer solder, copper metal serves as the second layer of composite interlayer solder, the bonding interface of the niobium metal and the titanium material is the interface 1, the bonding interface of the niobium metal and the copper metal is the interface 2, the bonding interface of the copper metal and the nickel material is the interface 3, and the focal point of a welding heat source is located near the interface 1; and in the welding process, heat generated by the welding heat source forms a fusion welding mode on the bonding interface of the first layer of composite interlayer solder and the titanium, and the heat is higher than the melting point of the second layer ofcomposite interlayer solder when transmitted to the interface 2 and the interface 3 through the first layer of composite interlayer solder. By means of the welding method, formation of titanium-nickel intermetallic compounds is avoided, a fusion welding seam is formed at the interface 1, soldered seams are formed at the interface 2 and the interface 3 at the same time, and the obtained titanium-nickel heterogenic metal joint achieves the tensile strength of 200-230 MPa and the elongation percentage of 2-4%.

Description

technical field [0001] The invention belongs to the field of welding technology of dissimilar metal materials, and in particular relates to a laser-induced monotectic and homogeneous reaction welding method for titanium-nickel heterogeneous joints. Background technique [0002] Titanium and its alloys are widely used in aerospace, petrochemical, and pressure vessel manufacturing due to their high specific strength, good corrosion resistance, and high temperature resistance. However, their use is limited by high raw material costs and poor processing performance. and other limitations, and when the temperature exceeds 400 ° C, the performance of titanium alloys decreases sharply. Nickel-based alloys can still work normally at 1000°C due to the addition of a large number of alloying elements, and have good high-temperature performance, but their weight is relatively high. If titanium and nickel are connected to develop titanium / nickel dissimilar metal components, the advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/211B23K26/70B23K103/18
CPCB23K26/211B23K26/70B23K2103/18
Inventor 高晓龙刘晶曹迪余浩魁刘欢
Owner BAOJI UNIV OF ARTS & SCI
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