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Features of the Structural Design of Welded Joints of Superelastic Nitinol Wires.

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Title: Features of the Structural Design of Welded Joints of Superelastic Nitinol Wires.
Authors: Kvasnytskyi, Viktor1 (AUTHOR) v.kvasnytskyi@kpi.ua, Zvorykina, Anastasiia1 (AUTHOR), Zvorykin, Leonid1 (AUTHOR), Zvorykin, Constantine1 (AUTHOR), Chvertko, Yevgenia1 (AUTHOR)
Source: Materials (1996-1944). Jan2026, Vol. 19 Issue 1, p7. 25p.
Subjects: Welded joints, Shape memory effect, Scanning electron microscopy, Electric welding, Shape memory alloys, Medical equipment, Fusion welding, Gas tungsten arc welding
Abstract: The object of the study is a permanent joint of thin wires made of nitinol alloy. The problem of ensuring the formation of a joint of wires made of nitinol alloy was solved based on minimising changes in the structure of the welded joint material relative to the materials being joined. The properties of the welded joint material of the nitinol were studied using scanning electron microscopy and micro-X-ray spectral analysis. The studied permanent joint was obtained by TIG, microplasma (PAW) and capacitor discharge (CDW) welding. It was found that TIG welding can ensure the proximity of the microstructures of the wire and welded joint materials under conditions of sufficient protection in an argon atmosphere. Such TiNi welded joints have a welded joint material that retains its superelastic properties (within the limits of the shape memory effect). Capacitor discharge welding allows the joint to be brought closer to the required level of microstructure of the weld material. The results of mechanical tests demonstrated the limited capabilities of joints made of thin nitinol wires. At the same time, the appearance of only newly formed TiNi + TiNi3 eutectics in the weld material and a sufficient level of restoration of the welded joint shape give reason to consider capacitor discharge welding promising for joining thin nitinol wires. PAW leads to the formation of a significant amount of oxides in the weld and an increase in the number of Ti2Ni inclusions, which leads to brittle fracture of the welded joint even at low degrees of deformation. The results of the study can be used, in particular, for the manufacture of nitinol wire joints in medical devices. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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PubType: Academic Journal
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  Data: Features of the Structural Design of Welded Joints of Superelastic Nitinol Wires.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Jan2026, Vol. 19 Issue 1, p7. 25p.
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  Data: <searchLink fieldCode="DE" term="%22Welded+joints%22">Welded joints</searchLink><br /><searchLink fieldCode="DE" term="%22Shape+memory+effect%22">Shape memory effect</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopy%22">Scanning electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+welding%22">Electric welding</searchLink><br /><searchLink fieldCode="DE" term="%22Shape+memory+alloys%22">Shape memory alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+equipment%22">Medical equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Fusion+welding%22">Fusion welding</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+tungsten+arc+welding%22">Gas tungsten arc welding</searchLink>
– Name: Abstract
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  Data: The object of the study is a permanent joint of thin wires made of nitinol alloy. The problem of ensuring the formation of a joint of wires made of nitinol alloy was solved based on minimising changes in the structure of the welded joint material relative to the materials being joined. The properties of the welded joint material of the nitinol were studied using scanning electron microscopy and micro-X-ray spectral analysis. The studied permanent joint was obtained by TIG, microplasma (PAW) and capacitor discharge (CDW) welding. It was found that TIG welding can ensure the proximity of the microstructures of the wire and welded joint materials under conditions of sufficient protection in an argon atmosphere. Such TiNi welded joints have a welded joint material that retains its superelastic properties (within the limits of the shape memory effect). Capacitor discharge welding allows the joint to be brought closer to the required level of microstructure of the weld material. The results of mechanical tests demonstrated the limited capabilities of joints made of thin nitinol wires. At the same time, the appearance of only newly formed TiNi + TiNi3 eutectics in the weld material and a sufficient level of restoration of the welded joint shape give reason to consider capacitor discharge welding promising for joining thin nitinol wires. PAW leads to the formation of a significant amount of oxides in the weld and an increase in the number of Ti2Ni inclusions, which leads to brittle fracture of the welded joint even at low degrees of deformation. The results of the study can be used, in particular, for the manufacture of nitinol wire joints in medical devices. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/ma19010007
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      – Code: eng
        Text: English
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        PageCount: 25
        StartPage: 7
    Subjects:
      – SubjectFull: Welded joints
        Type: general
      – SubjectFull: Shape memory effect
        Type: general
      – SubjectFull: Scanning electron microscopy
        Type: general
      – SubjectFull: Electric welding
        Type: general
      – SubjectFull: Shape memory alloys
        Type: general
      – SubjectFull: Medical equipment
        Type: general
      – SubjectFull: Fusion welding
        Type: general
      – SubjectFull: Gas tungsten arc welding
        Type: general
    Titles:
      – TitleFull: Features of the Structural Design of Welded Joints of Superelastic Nitinol Wires.
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            NameFull: Kvasnytskyi, Viktor
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              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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              Value: 19
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