Characterization of Nitinol Laser-Weld Joints by Nondestructive Testing

Markus Wohlschlögel, Gunter Gläßel, Daniela Sanchez, Andreas Schüßler, Alexander Dillenz, David Saal, Peter Mayr

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Joining technology is an integral part of today’s Nitinol medical device manufacturing. Besides crimping and riveting, laser welding is often applied to join components made from Nitinol to Nitinol, as well as Nitinol components to dissimilar materials. Other Nitinol joining techniques include adhesive bonding, soldering, and brazing. Typically, the performance of joints is assessed by destructive mechanical testing, on a process validation base. In this study, a nondestructive testing method—photothermal radiometry—is applied to characterize small Nitinol laser-weld joints used to connect two wire ends via a sleeve. Two different wire diameters are investigated. Effective joint connection cross sections are visualized using metallography techniques. Results of the nondestructive testing are correlated to data from destructive torsion testing, where the maximum torque at fracture is evaluated for the same joints and criteria for the differentiation of good and poor laser-welding quality by nondestructive testing are established.

Original languageEnglish
Pages (from-to)4991-4996
Number of pages6
JournalJournal of Materials Engineering and Performance
Volume24
Issue number12
DOIs
StatePublished - 1 Dec 2015
Externally publishedYes

Keywords

  • biomedical
  • joining
  • nondestructive testing
  • photothermal radiometry
  • torsion testing
  • welding

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