Automatic Welding, 2022, №12



2022 №12 (03)

DOI of Article 10.37434/as2022.12.04

2022 №12 (05)

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Avtomaticheskaya Svarka (Automatic Welding), #12, 2022, pp. 28-37

Producing nitinol brazed joints (Review)

S.V. Maksymova, B.V. Stefaniv

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Shape-memory alloys are becoming ever wider applied in different industries, in particular in aerospace, medical, automotive sectors and in consumer electronics manufacturing. Application of these materials as hybrid structure elements is a promising direction when creating products with a unique set of properties: high mechanical values, superplasticity, damping ability, higher wear resistance and thermomechanical memory. Production of nitinol permanent joints by welding leads to formation brittle phases of Ti2Ni type, which degrade the product quality. This review discusses the possibility of producing high-strength permanent joints of nitinol with nitinol and with other alloys by brazing. The main advantage, compared to other methods, is the fact that base metals do not melt, and some structural transformations can be avoided. At nitinol brazing in ambient air, brazing filler metals of Ag–Cu–Zn-Sn–Ni system haven proven themselves well, using 25AgCl–25KF–50LiCI flux. We should specially mention application of silver brazing filler metals and interlayers from pure metals, for instance, niobium, providing a strong metallurgical bond with the base metal. At brazing temperature of 1180 °С an alloy based on quasibinary NiTi–Nb eutectic system is formed, ensuring the reliability of brazed elements when creating prototypes of superplastic honeycomb shapes from titanium nickelide. 32 Ref., 4 Tabl., 8 Fig.
Keywords: titanium nickelide (nitinol), shape memory alloys (SMA), brazing filler metals, brazing, welding, wetting, intermetallic brittle compounds, strength, structure


Received: 27.10.2022

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