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Proceedings Paper

YAG laser micro welding of stainless steel and shape memory alloy
Author(s): Keisuke Uenishi; Masanori Seki; Takeshi Kunimasa; Masaya Takatsugu; Kojiro F. Kobayashi; Takeshi Ikeda; Akihiro Tsuboi
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Paper Abstract

In order to investigate the applicability of laser micro welding to the fabrication of medical devices, SUS304 stainless steel and Ti-Ni based shape memory alloy biomaterials wires were micro spot melted by using YAG laser. By the optimization of laser conditions such as laser power or pulse duration, sound spot melted wires free from any defects were prepared and the width of the melted metal was reduced to about 0.3mm for the 0.35mm diameter wires. Compared with the SUS304 wires, melting of shape memory alloy wires needed more precise control of laser conditions although it needed smaller power input. Melted metal exhibited a rapidly quenched microstructure. The spot melted wires showed comparable tensile strength or super-elastic behavior with base materials. Besides, by the microstructural observation and corrosion test in a quasi biological environment, corrosion resistance was estimated to be hardly degraded by spot melting. Crosswise or parallel joints was also successfully prepared by laser spot welding of wires, suggesting the laser micro welding is applicable to the fabrication of biomedical devices.

Paper Details

Date Published: 19 February 2003
PDF: 6 pages
Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); doi: 10.1117/12.499698
Show Author Affiliations
Keisuke Uenishi, Osaka Univ. (Japan)
Masanori Seki, Osaka Univ. (Japan)
Takeshi Kunimasa, Osaka Univ. (Japan)
Masaya Takatsugu, Osaka Univ. (Japan)
Kojiro F. Kobayashi, Osaka Univ. (Japan)
Takeshi Ikeda, Fine Process Co. Ltd. (Japan)
Akihiro Tsuboi, Fine Process Co. Ltd. (Japan)

Published in SPIE Proceedings Vol. 4830:
Third International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Kojiro F. Kobayashi; Koji Sugioka; Reinhart Poprawe; Henry Helvajian, Editor(s)

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