TY - JOUR T1 - Microstructural Characterisations of Welded Shape Memory Alloys AU - Doğan, Halit AU - Sarı, Nevzat PY - 2019 DA - December DO - 10.18466/cbayarfbe.497388 JF - Celal Bayar University Journal of Science JO - CBUJOS PB - Manisa Celal Bayar University WT - DergiPark SN - 1305-130X SP - 415 EP - 421 VL - 15 IS - 4 LA - en AB - Today, withthe development of technology, different welding methods are applied fordifferent alloys. In this work, changing of functional properties after usingwelding methods for NiTi alloy samples was targeted. However, two differentwelding methods were employed for the same alloy and results were compared toeach other and commented on them. In the present study, samples were weldedwith TIG and Laser welding and their cross section was examined in the jointarea. Then these samples were examined in optical microscope and SEM. Theadvantages and disadvantages of both welding methods were reported. The basic distinctionof TIG and laser welded samples examined in microscope was the scale of HAZarea of TIG welded piece. Nevertheless, due to more thermal input is appliedfor materials in TIG welded parts, more molten materials are detected or heateffects are attained in this practice. In laser welding, heat input is less andthis can be recognized from the observed micrographs. While HAZ area is obviouslydistinguished and welding border zone is detached from the base metal. The twinstructures were not observed in optical microscope; for that reason they wereinvestigated in SEM to see these twins in laser welded area. KW - NiTi KW - Shape Memory Alloy KW - Superelastic KW - Twinning CR - [1] Oliveira J P.; Miranda R M.; Braz Fernandes F.M. Welding and Joining of NiTi Shape Memory Alloys A Review, Progress in Materials Science, 2017; pp 412–466. 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