Welding of shape memory alloy to stainless steel for medical occluder

Dissimilar metal joining between NiTi shape memory alloy (SMA) and stainless steel was conducted. A cluster of NiTi SMA wires were first joined with tungsten inert gas (TIG) welding process, then the NiTi SMA TIG weld was welded to a stainless steel pipe with laser spot welding process. The microstr...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2013-01, Vol.23 (1), p.156-160
Main Authors: LÜ, Shi-xiong, YANG, Zhong-lin, DONG, Hong-gang
Format: Article
Language:English
Subjects:
(Fe,Ni)Ti
dissimilar metal joining
Intermetallic compounds
Intermetallics
laser spot welding
medical occluder
Ni3Ti
Nickel base alloys
Nickel compounds
Nickel titanides
NiTi alloy
shape memory alloy
Shape memory alloys
stainless steel
Stainless steels
Titanium compounds
Welded joints
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Summary:Dissimilar metal joining between NiTi shape memory alloy (SMA) and stainless steel was conducted. A cluster of NiTi SMA wires were first joined with tungsten inert gas (TIG) welding process, then the NiTi SMA TIG weld was welded to a stainless steel pipe with laser spot welding process. The microstructure of the welds was examined with an optical microscope and the elemental distribution in the welds was measured by electron probe microanalysis (EPMA). The results show that TiC compounds dispersively distribute in the NiTi SMA TIG weld. However, the amount of TiC compounds greatly decreases around the fusion boundary of the laser spot weld between the NiTi SMA and stainless steel. Mutual diffusion between NiTi shape memory alloy and stainless steel happen within a short distance near the fusion boundary, and intermetallic compounds such as Ni3Ti+(Fe,Ni)Ti appear around the fusion boundary.
ISSN:1003-6326
DOI:10.1016/S1003-6326(13)62442-5