Connecting method for TiNi shape memory alloy and stainless steel dissimilar material

A technology of memory alloys and dissimilar materials, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problems of high cost and high joint strength, and achieve the effect of improving joint strength, good connection, and reducing joint crack sensitivity.

Inactive Publication Date: 2009-05-13
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laser brazing is used to weld filamentary TiNi shape memory alloy and stainless steel dissimilar materials. The joint strength is high, up to 320-360MPa, but it needs to use special silver-based solder, which has high cost and is more suitable for lap joints. connector

Method used

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  • Connecting method for TiNi shape memory alloy and stainless steel dissimilar material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Nickel wire is used as filling material, inert gas protection, and low-power pulsed laser is used as heat source to weld TiNi shape memory alloy sheet and stainless steel sheet. TiNi shape memory alloy should be cleaned before welding, and the front and back of the welded joint need to be Argon is used for protection, and the back of the welded joint needs to be covered with a copper plate. The thickness of the material to be welded is 0.1mm. Degrease with acetone first, then soak the TiNi shape memory alloy in a mixed solution of hydrofluoric acid, nitric acid and water with a volume ratio of 2:1:5 for 15 minutes, and then rinse with water , Dry naturally. The nickel wire contains more than 99% Ni in mass percentage and has a diameter of 0.15mm. The nickel wire is preset between the TiNi shape memory alloy to be welded and the stainless steel before welding, and the misalignment during assembly cannot exceed 10% of the thickness of the material to be welded. The iner...

Embodiment 2

[0018] Nickel wire is used as filling material, inert gas protection, and low-power pulsed laser is used as heat source to weld TiNi shape memory alloy sheet and stainless steel sheet. TiNi shape memory alloy should be cleaned before welding, and the front and back of the welded joint need to be Argon is used for protection, and the back of the welded joint needs to be covered with a copper plate. The thickness of the material to be welded is 0.5mm. Degrease with acetone first, then soak the TiNi shape memory alloy in a mixed solution of hydrofluoric acid, nitric acid and water with a volume ratio of 2:1:5 for 15 minutes, and then rinse with water , Dry naturally. The nickel wire contains more than 99% Ni in mass percentage and has a diameter of 0.15 mm. The nickel wire is preset between the TiNi shape memory alloy to be welded and the stainless steel before welding, and the misalignment during assembly cannot exceed 10% of the thickness of the material to be welded. The ine...

Embodiment 3

[0020] Nickel wire is used as filling material, inert gas protection, and low-power pulsed laser is used as heat source to weld TiNi shape memory alloy sheet and stainless steel sheet. TiNi shape memory alloy should be cleaned before welding, and the front and back of the welded joint need to be Argon is used for protection, and the back of the welded joint needs to be covered with a copper plate. The thickness of the material to be welded is 0.2mm. Degrease with acetone first, then soak the TiNi shape memory alloy in a mixed solution of hydrofluoric acid, nitric acid and water with a volume ratio of 2:1:5 for 15 minutes, and then rinse with water , Dry naturally. The nickel wire contains more than 99% Ni in mass percentage and has a diameter of 0.3 mm. The nickel wire is preset between the TiNi shape memory alloy to be welded and the stainless steel before welding, and the misalignment during assembly cannot exceed 10% of the thickness of the material to be welded. The iner...

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Abstract

The invention relates to a method for connecting TiNi-shaped memory alloy and stainless steel dissimilar materials, the method is characterized in that the steps of the process method are as follows: taking nickel wire as filling materials for protection by inactive gases, taking low-power pulse laser as heat sources to weld sheet-shaped TiNi-shaped memory alloy and stainless steel, cleaning the TiNi-shaped memory alloy before welding, using the TiNi-shaped memory alloy sheet after cleaning within 6 hours and protecting both the front side and the rear side of the welding joint by adopting argon gas. The invention has the advantages that the method adopts nickel wire as filling materials so as to effectively obstruct the formation of the fragile intermetallic compound in the welding joint, and the method adopts the protection of bifacial inactive gas to overcome the influence for performances of the welding joint due to oxygen and nitrogen in the atmosphere, thereby reducing the sensibility of the joint cracks and realizing good connection of the sheet-shaped TiNi-shaped memory alloy and stainless steel dissimilar materials.

Description

technical field [0001] The invention relates to a connection method of dissimilar materials, in particular to a connection method of TiNi shape memory alloy and stainless steel dissimilar materials. Background technique [0002] TiNi shape memory alloy is a new type of functional material with special shape memory effect, superelasticity, high strength and good corrosion resistance. It has obtained important applications and is called "the ideal material across the 21st century". However, TiNi shape memory alloys are expensive. In order to reduce costs in practical applications, TiNi shape memory alloys often need to be connected with other materials, especially in medical devices, microelectronics and aerospace, often with stainless steel materials. [0003] However, when TiNi shape memory alloy and stainless steel dissimilar materials are welded, because intermetallic compounds are easily formed in the joint, the strength of the welded joint is much lower than that of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/42B23K26/12B23K103/18B23K26/211B23K26/60
Inventor 陈玉华柯黎明刑丽徐世龙黄永德
Owner NANCHANG HANGKONG UNIVERSITY
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