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A method for connecting ultra-thin nitinb wide hysteresis shape memory alloy and titanium alloy dissimilar materials

A memory alloy and connection method technology, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of refractory filling material, large welding stress, grain coarsening, etc., to eliminate joint cracks and low cost , the effect of good joint quality

Inactive Publication Date: 2016-08-24
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ordinary welding methods are easy to produce large welding stress and large deformation, serious grain coarsening, and high melting point filler materials are difficult to melt, and laser welding can solve these problems well due to the concentration of energy density

Method used

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  • A method for connecting ultra-thin nitinb wide hysteresis shape memory alloy and titanium alloy dissimilar materials
  • A method for connecting ultra-thin nitinb wide hysteresis shape memory alloy and titanium alloy dissimilar materials
  • A method for connecting ultra-thin nitinb wide hysteresis shape memory alloy and titanium alloy dissimilar materials

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Experimental program
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Embodiment

[0018] Embodiment: welding process of the present invention is as follows:

[0019] Welding equipment: Sisma SL80 Nd:YAG laser welding machine, laser power is 16W, pulse width is 4.5ms, frequency is 4.5Hz, spot diameter is Φ0.3mm, surface focusing, welding speed is 0.3m / min, argon gas flow rate is 8L / min. The base metal is 0.3mm thick hot-rolled NiTiNb wide hysteresis shape memory alloy, 0.2mm thick annealed TC4 titanium alloy, and the filling material is pure Nb wire with a diameter of Φ0.3mm.

[0020] 1. Preparation stage before welding

[0021] Soak the NiTiNb base metal in a mixed solution of hydrofluoric acid, nitric acid and water with a volume ratio of 1:3:5 for about 3 minutes, corrode the base metal to a thickness of 0.2±0.01mm, and then rinse with clean water. The oxide on the surface of TC4 base metal is polished with sandpaper. Grind the welded end face flat on sandpaper, then clean it with acetone, and put it in an oven to dry the water;

[0022] 2. Assembly a...

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Abstract

A method for connecting an ultra-thin NiTiNb wide hysteresis shape memory alloy and a titanium alloy dissimilar material. In the middle of the base metal joint, fix the base metal; pass high-purity argon gas to exhaust the air in the glass cover; use a small laser power at both ends of the joint to position the Nb wire and the base metal; adjust the appropriate laser process parameters Weld the joint. The invention eliminates the crack of the welded joint and realizes the laser welding of the ultra-thin NiTiNb wide hysteresis shape memory alloy and the titanium alloy dissimilar material. The maximum tensile strength of the welded joint between NiTiNb and TC4 titanium alloy is 740MPa, which is 82% of the tensile strength of the annealed TC4 base metal (895MPa). The welding process has low cost, high efficiency and good joint quality.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for connecting ultra-thin NiTiNb wide hysteresis shape memory alloy and titanium alloy dissimilar materials. Background technique [0002] NiTiNb (Ni 47 Ti 44 Nb 9 , molar ratio, referred to as NiTiNb) is a wide hysteresis shape memory alloy, the phase transition hysteresis width can reach 150 ℃. Titanium alloy is a lightweight alloy with high specific strength. The connection structure of shape memory alloy and titanium alloy is more and more widely used in the fields of aerospace, automobile and biomedicine, especially in the field of biomedicine, most of which are ultra-thin materials with a thickness of less than 0.2mm. However, it is very difficult to weld these two metals by fusion welding, the tensile strength of the joint is almost 0, and the joint deformation is relatively large. The main reason is that a large amount of Ti will be produced near the weld f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21B23K26/323B23K26/60B23K26/12
CPCB23K26/14B23K26/20
Inventor 陈玉华陆巍巍黄永德
Owner NANCHANG HANGKONG UNIVERSITY