The Influence of Shielding Gases on Solidification Structures and Grain Size of AISI 304 Stainless Steel Fiber Laser Welds
- 78 Downloads
In laser welding, shielding gas should be carefully selected so that welding joints have an acceptable weld profile and weld quality. Bead-on-plate welding of AISI 304 stainless steel plates with 5 kW continuous wave (CW) fiber laser was performed with different nitrogen and argon mixtures. Fusion zone (FZ) morphology and microstructural characteristics of welds were investigated. The outcome was that nitrogen had a great effect on the final microstructure of the fusion zone, reducing the ferrite content and changing the microstructure grain size which will reflect on the mechanical properties of the weld zone.
KeywordsLaser welding Austenitic stainless steel Shielding gas Solidification structure Grain size
The authors wish to gratefully acknowledge the support and generosity of Prof. Dr. Seiji Katayama, JWRI, Osaka University without which the present study could not have been completed; the acknowledgment extends to all of his Lab. members.
- 1.Klimpel, A., Lisiecki, A., Janicki, D.: Proceedings of the institution of mechanical engineers , part B : journal of engineering manufacture the influence of the shielding gas on the properties of a laser-melted surface of austenitic stainless steel. Proc. Inst. Mech. Eng. B J. Eng. Manuf. 218(9), 1137–1144 (2004). https://doi.org/10.1243/0954405041897130 CrossRefGoogle Scholar
- 2.Keskitalo, M., Mentyjärvi, K., Sundqvist, J., Eriksson, I., Kaplan, A.: The influence of shielding gas on the properties of laser welded stainless steel. In: Nord. Laser Mater. Process. Conf. 26/08/2013–28/08/2013, pp. 155–161 (2013)Google Scholar
- 11.Ma, J.C., Yang, Y.S., Tong, W.H., Fang, Y., Yu, Y., Hu, Z.Q.: Microstructural evolution in AISI 304 stainless steel during directional solidification and subsequent solid-state transformation. Mater. Sci. Eng. A. 444(1-2), 64–68 (2007). https://doi.org/10.1016/j.msea.2006.08.039 CrossRefGoogle Scholar
- 12.Sato, Y., Dong, W., Kokawa, H., Kuwana, T.: Nitrogen absorption by Iron and stainless steels during YAG laser welding. ISIJ Int.. 40(Suppl), S20–S24 (2008). https://doi.org/10.2355/isijinternational.40.suppl_s20 CrossRefGoogle Scholar
- 15.Okagawa, R., Dixon, R.D., Olson, D.L.: The influence of nitrogen from welding on stainless steel weld metal microstructures. Weld. J. 62, 204–209 (1983)Google Scholar
- 16.Siewert, T., Koteckim, D.: Constitution diagram for stainless steel weld metals a modification of the WRC. Weld. J. 14, 171–178 (1992)Google Scholar
- 20.Zhou, S.C., Yang, J., Yang, Y.J.: Effect of nitrogen on solidification structure of continuous casting AISI410 martensitic stainless steel. Metal. Int. 17, 40–43 (2012)Google Scholar
- 22.Lehto, P., Romanoff, J., Remes, H., Sarikka, T.: Characterisation of local grain size variation, weld. World. 60, 1–22 (2016)Google Scholar