Microstructure characteristic of TIG and laser welding of Super Duplex Stainless Steel
Keywords:
Super duplex stainless steel, TIG welding, Microstructure, Neutrosophic, Laser beam weldingAbstract
The present study is concerned with active tungsten inert gas (ATIG) and laser beam welding techniques and their effects on size and microstructure of fusion zone, then on hardness of weld joints of the super duplex stainless steel (SDSS 2507) plates of 3mm thickness. The results achieved in this study disclosed that different types welding techniques play an important role in obtaining satisfactory properties of welded joint. Using nitrogen as shielding gas with argon content in case laser beam welding has resulted in improving microstructure of welded joint in comparison with that of TIG were silica flux was used as an activated material, the hardness profiles reveal that there is no significant difference between hardness of beam metal, BM and that of weld metal, WM but significant increase in hardness of HAZ regardless of welding process. The phase transformations produced during laser beam welding resulted improper ferrite/austenite balance due to decreasing austenite content but in a TIG welding there was an increasing in ferrite content.
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References
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