Lasers in Manufacturing and Materials Processing

, Volume 6, Issue 4, pp 345–355 | Cite as

The Influence of Shielding Gases on Solidification Structures and Grain Size of AISI 304 Stainless Steel Fiber Laser Welds

  • K. M. HafezEmail author
  • M. M. Ghanem
  • M. A. Morsy


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.


Laser 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.


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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Central Metallurgical Research and development institute (CMRDI)HelwanEgypt

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