Product Code: PIC2008_302

Laser Welding of Niti Shape Memory Alloy
Authors:
Wang Wei, Beijing Aeronautical Manufacturing Technology Research Institute;Beijing University of Science and Technology;Aviation University of Air Force; Beijing Peoples Republic of China
Li Chen, Beijing Aeronautical Manufacturing Technology Research Institute ; Beijing Peoples Republic of China
Xing-Ke Zhao, University of Science and Technology ; Beijing Peoples Republic of China
Ji-Hua Huang, University of Science and Technology ; Beijing Peoples Republic of China
Presented at PICALO 2008

With high energy YAG Laser beam method, the weld ability of the TiNi shape memory alloy sheet was studied.The mechanical properties of both reference and laser welded samples were tested by stressstrain measurements. A systematic comparison of the results was carried out. Moreover, differential scanning calorimeter (DSC) investigations on samples taken from the heat affected zone and hardness measurements allowed further clarification that the modification was induced by the welding procedure. The crystal grain in welded joint is large , and new phases such as Ni3Ti separate out.The results obtained on laser welded samples indicate the recovery mechanisms are little weakly modified by the presence of the welding zone.

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