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Published on: August 13, 2019
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Technology and Properties of Peripheral Laser-Welded Micro-Joints
Szymon Tofil1, Hubert Danielewski1, Grzegorz Witkowski1
1Laser Research Centre, Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel, Switzerland)
|July 2, 2021
Summary
This study details laser welding parameters for strong AISI 316L steel micro-couplings used in medical devices. Optimal settings ensure high joint strength and uniform element distribution for reliable performance.
Area of Science:
- Materials Science
- Mechanical Engineering
- Manufacturing Technology
Background:
- Micro-couplings are critical components in medical equipment.
- Laser welding offers precision for joining small, thin-walled metallic parts.
- AISI 316L steel is a common material in medical devices due to its biocompatibility and corrosion resistance.
Purpose of the Study:
- To determine optimal parameters for laser welding of thin-walled AISI 316L steel micro-couplings.
- To characterize the properties of laser-welded joints.
- To establish the range of effective welding parameters for micro-joining applications.
Main Methods:
- Laser welding using a SISMA LM-D210 Nd:YAG laser.
- Macroscopic and microscopic analysis of welded samples.
- Assessment of elemental distribution, microhardness, and tear strength.
- Testing of thin-walled AISI 316L steel pipes (1.5 and 2 mm diameter).
Main Results:
- Recommended welding parameters: 2.05 J pulse energy, 4 ms pulse duration, 2 Hz frequency, 0.4 mm beam focus diameter, 0.157 rad/s rotation speed.
- Achieved joint strength exceeding 75% of the thinner pipe's strength.
- Observed uniform distribution of alloying elements within the weld.
- Identified a complex dendritic structure typical of pulse laser welding.
Conclusions:
- The established laser welding parameters provide high-quality micro-couplings.
- The developed technology ensures reliable joints with excellent mechanical and material properties for medical applications.
- The research provides a foundation for optimizing laser welding processes for similar micro-joining tasks.
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