Microstructural Characterisations of Welded Shape Memory Alloys
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Date
2019
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Abstract
Today, with the development of technology, different welding methods were applied for different alloys. In thiswork, changing of functional properties after using welding methods for NiTi alloy samples were aimed.However, two different welding methods were employed for the same alloy and results were compared to eachother and commented on them. In the present study, samples were welded with TIG and Laser welding and theircross section of welded zone was examined. Then these samples were examined in optical microscope andSEM. The advantages and disadvantages of both welding methods were reported. The basic distinction of TIGand laser welded samples examined in microscope were the scale of HAZ (Heat Affected Zone) of TIG weldedsamples. Nevertheless, due to more thermal input was applied for materials in TIG welded parts, more moltenmaterials were detected, or heat effects were attained in this practice. In laser welding, heat input was less, andthis could be recognized from the observed micrographs. When SEM figures were investigated, While HAZwas obviously distinguished from border of welding bath and the base metal was been separated from HAZ too.The twin structures were not observed in optical microscope; for that reason, they were investigated in SEM tosee these twins in laser welded area.