TY - JOUR
T1 - Characterization of Nitinol Laser-Weld Joints by Nondestructive Testing
AU - Wohlschlögel, Markus
AU - Gläßel, Gunter
AU - Sanchez, Daniela
AU - Schüßler, Andreas
AU - Dillenz, Alexander
AU - Saal, David
AU - Mayr, Peter
N1 - Publisher Copyright:
© 2015, ASM International.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - 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.
AB - 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.
KW - biomedical
KW - joining
KW - nondestructive testing
KW - photothermal radiometry
KW - torsion testing
KW - welding
UR - http://www.scopus.com/inward/record.url?scp=84949089256&partnerID=8YFLogxK
U2 - 10.1007/s11665-015-1791-8
DO - 10.1007/s11665-015-1791-8
M3 - Article
AN - SCOPUS:84949089256
SN - 1059-9495
VL - 24
SP - 4991
EP - 4996
JO - Journal of Materials Engineering and Performance
JF - Journal of Materials Engineering and Performance
IS - 12
ER -