CO2 laser welding of glass: numerical simulation and experimental study
Automated laser welding with filler wires for bridging gaps and for connecting complex devices has been established for different metal materials. In spite of that, it is still a challenge to transfer this welding process to the brittle material glass. Therefore, glass welding is often realized through a manual process by heating the glass with a gas flame. In addition, welding of non-rotational components requires filler material for gap bridging between the joining partners, which is applied manually today.
This work presents an experimental and numerical study on laser welding of fused silica using glass fiber as a filler material to bridge gaps. The goal was to achieve a defined weld penetration depth and heat affected zone which is important for the production of optical elements. Therefore, a CO2 laser heats up the glass components as well as the glass fiber within a temperature controlled welding process. The numerical investigations were used to identify the general process window for welding fused silica.
Within the experimental study, the process parameters, such as the defined welding temperature, laser focal spot size, and feed rate were varied to investigate their impact on the welding outcome. In addition, the impact of the filler wire coating on the material composition of the welded component in the joint zone was investigated.
Compared to the manual process, laser welding with glass fiber as a filling material leads to a highly reproducible process enabling a high automation level.
KeywordsGlass Fused silica Welding CO2 laser Numerical simulation Glass fiber Gap bridging
Unable to display preview. Download preview PDF.
- 2.Panjawat Kongsuwan, Gen Satoh and Y. Lawrence Yao, 2012, “Transmission Welding of Glass by Femtosecond Laser: Mechanism and Fracture Strength” ASME Trans. J. of Manufacturing Science and Engineering, February 2012, Vol. 134, 011004-1 to 11.Google Scholar
- 3.Richter, L.; Overmeyer, L. (Hrsg.) (2010): Fügen von Rohrglas mittels CO2 Laserstrahlung, Berichte aus dem LZH. Garbsen: PZH - Produktionstechnisches Zentrum GmbH: 75–136Google Scholar
- 5.Pohl, L., von Witzendorff, P., Suttmann, O., Overmeyer, L.. 2014, “Automated laser-based glass fusing with powder additive”, 2014, ICALEO 2014 Proceedings,33rd International Congress on Applications of Lasers & Electro -Optics, ICALEO 2014, San Diego, USA, 19 Oct 2014 - 23 Oct 2014, (2014)Google Scholar
- 7.Luo J, Pan H, Kinzel E C, (2014) "Additive Manufacturing of Glass" Journal of Manufacturing Science and Engineering, DECEMBER 2014, Vol. 136 / 061024-1 - 061024–6Google Scholar
- 8.Heraeus Quarzglas GmbH & Co KG, 2016, Quartz Glass Plates, Technical Properties, brochure 2016 Download:https://www.heraeus.com/en/hqs/download_hqs/downloads_fused_silica.aspx
- 9.Heraeus Quarzglas GmbH & Co. KG, CFQ 099 / HSQ 100 / HSQ 300 / HSQ 700 Electrically Fused Quartz Glass, brochure 2002, Repro. UNICOGoogle Scholar
- 10.Staupendahl G, Gerling P, 1998 : “Untersuchungen zur CO2- Lasermaterialbearbeitung mit dynamischen Strahlparametern”, Bremen 1998, Strahl-Stoff-Wechselwirkungen bei der Lasermaterialbearbeitung 2.Bd. 6, Bremen: BIAS 1998Google Scholar
- 11.Buerhop C, Weissmann R,1996, „Temperature Development of Glass during CO2-laser irradiation“ Part 1. Mesurement and Calculation, Glass technology, Vol. 37(2), 1996, pp. 69–73Google Scholar