Dissimilar material connecting method of nickel titanium shape memory alloy and copper alloy and clamp thereof

A memory alloy and connection method technology, applied in manufacturing tools, welding equipment, welding equipment, etc., can solve problems such as high resistivity, difficulty in meeting the performance requirements of electronic products with a single material, large differences in melting point and coefficient of linear expansion, etc.

Inactive Publication Date: 2015-01-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high resistivity of nickel-titanium shape memory alloys, it is difficult for a single material to meet the performance requirements of electronic products. In addition, in order to realize remote control and operation, it is also necessary to combine nickel-titanium shape memory alloys with copper alloys commonly used in the electronics and electrical fields. connect them
Due to the large difference in melting point and linear expansion coefficient between nickel-titanium shape memory alloy and copper alloy dissimilar materials, the electrical and mechanical properties of the joint are seriously affected.
The main problem is that the copper alloy has a high reflectivity to the laser, and a large amount of copper-titanium intermetallic compounds (mainly including: Cu 4 Ti, Cu 2 Ti, Cu 3 Ti 2 , Cu 4 Ti 3 , CuTi, and CuTi 2 etc.), significantly reducing the strength, toughness and electrical conductivity of the welded joint

Method used

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  • Dissimilar material connecting method of nickel titanium shape memory alloy and copper alloy and clamp thereof
  • Dissimilar material connecting method of nickel titanium shape memory alloy and copper alloy and clamp thereof
  • Dissimilar material connecting method of nickel titanium shape memory alloy and copper alloy and clamp thereof

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Effect test

Embodiment 1

[0031] Embodiment 1, adopt the method of the present invention to carry out the laser welding of nickel-titanium alloy wire and red copper strip. The diameter of the nickel-titanium alloy wire is 0.70mm, and the interface size of the copper strip is 2.00mm (width)*0.50mm (thickness). Put the nickel-titanium alloy wire on top of the copper strip, press it with a self-made fixture (without leaving a gap), and use a pulsed laser heat source to melt the nickel-titanium alloy wire and part of the brass strip to form a lap joint of dissimilar materials. Laser welding process parameters: peak power 2.2KW, pulse width 20ms, pulse energy 26.9J; solder joint overlap rate 60%; shielding gas (Ar) flow rate 40 CFH; post-weld heat treatment temperature: 400°C, holding time: 20min. The shear force of the laser lap joint of nickel-titanium alloy wire-brass strip dissimilar materials can reach 266N, and the deformation recovery rate can reach 92%.

Embodiment 2

[0032]Embodiment 2, adopt the method of the present invention to carry out the laser welding of nickel-titanium alloy strip material and brass strip material. The interface size of the nickel-titanium alloy strip is 2.00mm (width)*0.40mm (thickness), and the interface size of the brass strip is 2.00mm (width)*0.50mm (thickness). Put the brass strip on the upper end, press it with a self-made fixture (without leaving a gap), and use a pulsed laser heat source to melt the brass strip to form a lap joint of brass-nickel-titanium alloy dissimilar materials. Laser welding process parameters: peak power 2.4KW, pulse width 30ms, pulse energy 36.6J; solder joint overlap rate 50%; shielding gas (Ar) flow rate 40 CFH; post-weld heat treatment temperature: 400 ° C, holding time: 10 min. The shear force of the laser lap joint of nickel-titanium alloy wire-brass strip dissimilar materials can reach 242N, and the deformation recovery rate can reach 90%.

Embodiment 3

[0033] Embodiment 3, adopt the method of the present invention to carry out the laser welding of nickel-titanium alloy wire and red copper wire. The diameter of the nickel-titanium alloy wire is 0.40mm, and the diameter of the copper wire is 0.40mm. The nickel-titanium alloy wire and the red copper wire are placed in parallel, pressed with a self-made fixture (without leaving a gap), and a pulsed laser heat source is used to melt and connect the interface strips to form a butt welded joint of dissimilar materials. Laser welding process parameters: peak power 1.6KW, pulse width 20ms, pulse energy 18.8J; solder joint overlap rate 60%; shielding gas (Ar) flow rate 30L / min; post-weld heat treatment temperature: 450-500 ℃, holding time: 10 min. The tensile strength of the laser lap joint of nickel-titanium alloy wire-brass strip dissimilar materials can reach more than 260 Mpa, and the temperature hysteresis is 12°C lower than that of the nickel-titanium shape memory alloy base ma...

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Abstract

The invention relates to a laser welding method of nickel titanium shape memory alloy and copper alloy in the technical field of materials, machines, electrical engineering and the like, belongs to the technical field of dissimilar material connecting. According to the method, the functions of a sensor, an executor and the like are achieved through the high conductivity of copper and the superelasticity or shape memory character of nickel titanium alloy. The method comprises the process steps that after the to-be-welded face of a nickel titanium shape memory alloy and copper alloy wire or belt or plate is polished and washed, the lap-joint or butt-joint mode is adopted, a designed clamp is utilized, the nickel titanium shape memory alloy part or the connecting position is heated through a Nd:YAG laser device, and a high-strength, defect-free and low-impedance dissimilar material welding connector can be obtained by adjusting laser and heat treatment process parameters.

Description

technical field [0001] The invention relates to a connection technology of dissimilar materials, specifically a method for connecting dissimilar materials of a nickel-titanium shape memory alloy and a copper alloy, which relates to technical fields such as materials, machinery, electronics, and electricity. Background technique [0002] Nickel-titanium shape memory alloy is the most widely used smart material, in which the atomic percentage of nickel and titanium is about 1:1, and has special shape memory effect (shape memory effect, SME) and superelasticity (pseudoelasticity, PE). In addition, it also has the characteristics of high specific strength, fatigue resistance and corrosion resistance, and is widely used in aerospace, instrumentation and medical fields. At present, smart materials represented by nickel-titanium shape memory alloys have begun to be gradually applied in the electronic and electrical fields, including fastening components, electrical connectors, elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/70B23K37/04C21D9/50
CPCB23K26/14B23K26/20B23K37/0435B23K2103/12B23K2103/14
Inventor 曾志周志明李迅波黄波李淼汤茂林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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