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Titanium-copper dissimilar metal joint welding method

A technology of heterogeneous metals and welding methods, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problem of insufficient contact interface temperature, and achieve the effect of high weld interface bonding

Active Publication Date: 2017-10-27
BAOJI UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method adopts the method of fusion welding + contact reaction brazing, using the heat conduction effect of niobium, and because the thermal conductivity of titanium alloy and stainless steel is not much different, when the contact surface of titanium alloy and niobium is melted, the temperature of the contact surface of niobium and stainless steel Higher than the eutectic temperature of niobium and iron, and then realize welding, but this method is only suitable for two materials with little difference in thermal conductivity. When the thermal conductivity of the two materials is very different, it will lead to heat conduction to Nb and heat conduction When a material with high performance contacts the interface, due to the rapid transfer of heat to the material itself, the temperature of the contact interface cannot reach above the eutectic temperature point of the two materials, and the solder and the material with high thermal conductivity cannot be welded successfully

Method used

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  • Titanium-copper dissimilar metal joint welding method
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  • Titanium-copper dissimilar metal joint welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Pulse laser welding is performed on TC4 titanium alloy and pure Cu. The CT4 titanium alloy plate is the same size as the pure copper plate, which is 100mm (length) × 50mm (width) × 1.2mm (thickness). The 1mm thick niobium interlayer solder Placed between the TC4 titanium alloy plate and the pure copper plate interface, there is no gap between the niobium intermediate layer and the titanium alloy and pure copper interface respectively, and the thickness of the niobium intermediate layer solder is 0.8mm (that is, the distance between the Ti / Nb interface and the Nb / Cu interface) , place the pulsed laser spot at a distance of 0.4 mm from the Ti / Nb interface, and perform pulsed laser welding under a double-sided argon protective atmosphere, such as figure 1 with figure 2As shown, through the control of pulsed laser parameters, the melting is controlled in the area near the Ti / Nb interface. There is an unmelted Nb layer between the Ti / Nb interface and the Nb / Cu interface, an...

Embodiment 2

[0043] Pulse laser welding is performed on TC4 titanium alloy and pure Cu. The CT4 titanium alloy plate is the same size as the pure copper plate, which is 100mm (length) × 50mm (width) × 1.0mm (thickness). The 0.8mm thick niobium interlayer The solder is placed between the interface between the TC4 titanium alloy plate and the pure copper plate. There is no gap between the niobium interlayer and the titanium alloy and pure copper interface respectively. The width of the niobium interlayer solder is 1.0mm (that is, the distance between the Ti / Nb interface and the Nb / Cu interface ), the pulsed laser spot was placed at a distance of 0.6 mm from the Ti / Nb interface, and the pulsed laser welding was performed under a double-sided argon protective atmosphere. The pulsed laser welding process parameters were: laser peak power 1.5kW, pulse width 12ms, pulse frequency 40Hz, The welding speed is 400mm / min, the defocusing amount is 0mm, and in the double-sided protective atmosphere, the ...

Embodiment 3

[0047] Pulse laser welding is performed on TC4 titanium alloy and pure Cu. The CT4 titanium alloy plate is the same size as the pure copper plate, which is 100mm (length) × 50mm (width) × 1.0mm (thickness). The 1.2mm thick niobium interlayer The solder is placed between the interface between the TC4 titanium alloy plate and the pure copper plate. There is no gap between the niobium interlayer and the titanium alloy and pure copper interface respectively. The width of the niobium interlayer solder is 0.8mm (that is, the distance between the Ti / Nb interface and the Nb / Cu interface ), the pulsed laser spot was placed at a distance of 0.5 mm from the Ti / Nb interface, and pulsed laser welding was performed under an argon protective atmosphere on both sides to obtain a titanium-copper heterogeneous metal joint.

[0048] The pulse laser welding process parameters are: laser peak power 1.5kW, pulse width 18ms, pulse frequency 50Hz, welding speed 300mm / min, defocus amount 0.3mm, double-...

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Abstract

The invention discloses a titanium-copper dissimilar metal joint welding method, and belongs to the field of metal material interface welding process. The method includes the steps that middle layer welding flux is added between a titanium material and a copper material, the combining interface between the middle layer welding flux and the titanium material is the interface I, the combining interface between the middle layer welding flux and the copper material is the interface II, and welding heat source focal points are located in the middle layer welding flux; in the welding process, it is ensured that when heat generated by a welding heat source is conducted to the interface I, the temperature generated by the heat is higher than the titanium melting point, when the heat is conducted to the interface II, the temperature generated by the heat is higher that the eutectic temperature of the middle layer welding flux and copper, a non-melting welding flux layer exists between the interface I and the interface II, and the middle layer welding flux is a metal material which generates no intermetallic compound with the titanium material and / or copper material. A titanium-copper intermetallic compound is prevented from being formed by means of the welding method, titanium-niobium and copper-niobium melt-brazed seams can be formed at the same time, the extension strength of the obtained titanium-copper dissimilar metal joint reaches 200-240 MPa, the elongation percentage is 30-40%, and the welding interface does not fracture.

Description

technical field [0001] The invention belongs to the field of metal material interface welding technology, and in particular relates to a welding method for heterogeneous metal joints composed of titanium materials and copper materials. Background technique [0002] Titanium and titanium alloys have the characteristics of light weight, high strength, good corrosion resistance, excellent high temperature performance and biocompatibility, and are widely used in aerospace, petrochemical, biomedical and other fields. Copper and copper alloys usually have excellent electrical and thermal conductivity, good cold and hot processing performance, high oxidation resistance and corrosion resistance of organic chemicals, and are widely used in electrical, electronic, power, chemical and other industrial sectors. The high-quality and high-strength connection of Ti / Cu dissimilar metals can meet the weight reduction and functional requirements of some special components, and has broad appli...

Claims

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Application Information

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IPC IPC(8): B23K26/12B23K26/211B23K26/40B23K103/18
CPCB23K26/123B23K26/211B23K26/40B23K2103/18
Inventor 高晓龙刘晶张林杰余浩魁
Owner BAOJI UNIV OF ARTS & SCI
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