Welding for medical devices often requires a very delicate and specific process; one that can be tailored to unique geometry and form autogenous welds (containing no filler material). Resistance welding and laser welding both fit the aforementioned criteria. However, the differences between these processes impact part design, process control, and the type of bond that is formed between components.
Here’s a quick comparison between resistance welding and laser welding:
Resistance Welding for Medical Devices
- An electric current generates heat. This softens and joins the metal, forming a solid state bond.
- Forms an internal weld, avoiding possible air contamination.
- Excellent for welding fine foils and wires.
Laser Welding for Medical Devices
- Absorbed energy melts the metals to form a bond (fusion weld).
- Laser welding makes an external weld. The laser interacts with a small area of the component.
- Several weld configuration choices are available. Specially ideal for for hermetic seam welds.
Further Reading: Welding for Medical Devices
One of our partners, Dr. Girish P. Kelkar of WJM Technologies has written an excellent primer on the subject, “Resistance and Laser Welding for Medical Devices”. With over 30 years of experience in the field, Dr. Kelkar has been a valuable resource as a consultant, and our technicians have taken advantage of his training courses as part of their professional development.
His article discusses:
- Weld configurations for resistance welding and laser welding
- Types of bonds
- Process control and monitoring
- Weld testing and analysis
Questions?
Every project and circumstance is unique. Contact one of our experts! We’re happy to make recommendations and answer any questions you may have.