Abstract
Procedures for welding duplex stainless steel conventional arc welding methods were studied by several authors and nowadays and recently they are well handled. Todays practice requires application of processes providing excellent weld joint quality, quick production and possibility of automation. Therefore the application of laser beam welding has a great potential of application. This research paper describes weldability of DSS 2205 by laser beam. The main factor examined in the process of welding duplex steel is the shielding gas and his effect on weld joint properties. Welding was performed with gaseous CO2 laser machine Ferranti Photonics AF 8 having 8 kW max. output power and wave length 10.6 µm. Microstructure of weld joint specimens was analysed in order to observe the phase composition ratio. Samples are welded with same process parameters except of shielding gas. Helium and nitrogen were applied as a shielding gas to examine their influence in comparison to weld joints welded without shielding gas. Since the nitrogen promotes the austenite formation, its application brought the best results having almost same phase composition as base material.
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