M. I. Khan, N. Y. Zhou, Univeristy of Waterloo, Waterloo, ON, Canada
Pulsed Nd:YAG laser micro-welding (LMW) is a joining process widely used in the fabrication of implantable medical devices, such as pacemakers and orthodontic brackets. The excellent corrosion resistance of 316 low-carbon vacuum melted (LVM) stainless steel (SS) wire makes it ideal for biomedical applications. To date, limited work has been published on LMW of 316 LVM. In the current study, optimization of the bonding conditions for LMW of crossed 316 LVM was carried out by examining key welding parameters including pulse energy and width. Mechanical performances of welds are investigated by obtaining the joint breaking force (JBF) using a micro-tensile tester and scanning electron microscopy (SEM) facilitated the examination of fracture surfaces. Weld cross-sections are used to characterize metallurgical observations and detail the bonding mechanism. In addition, a comparison of resistance micro-welding (RMW) and LMW of 316LVM is discussed.
Summary: In this study the laser micro-welding (LMW) of crossed 316LVM stainless steel wire is investigated. Microstructure and mechanical properties of welds are detailed. Furthermore, the bonding mechanism is detailed and compared to the resistance micro-welding (RMW).
