Laser beam welding has been progressively replacing conventional arc process in many industry practices due to their productivity, repeatability and low consumables costs. However, in some cases, carefully metallurgical characterization must be done because of the effect of rapid cooling and small defects. This work compares orbital TIG welding to laser welding for an austenitic-ferritic duplex steel tube, particularly suited to high corrosive mediums. The primary phase for both cases was ferrite, but austenite was present at grain boundaries and intergranularly as Widmanstätten and plate-like precipitates. Lasered samples presented much finer constituents in the fusion and the heat affect zones. Tensile strengths were quite similar in both cases, and also similar to the industrial standards.

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