Process Window for Nd:YAG Laser Welding of Super Duplex Stainless Steel |
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Authors: | N. Sivagurumanikandan S. Saravanan G. Sivakumar K. Raghukandan |
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Affiliation: | 1.Department of Manufacturing Engineering,Annamalai University,Annamalainagar,India;2.Department of Mechanical Engineering,Annamalai University,Annamalainagar,India;3.Department of Mechanical Engineering,Ibra College of Technology,Ibra,Oman |
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Abstract: | Super duplex stainless steel (SDSS), an advanced duplex stainless steel with higher alloying concentration, is employed widely in acidic atmospheres. In this study, we make an attempt to develop a process window for the pulsed mode Nd:YAG laser welding of SDSS, as reference maps, to identify the range of process parameters viz., laser power, welding speed, defocusing distance, and pulse frequency for obtaining a defect free full penetration welds. The eminence of the welds, based on the macrostructure, microstructure, and tensile strength, is reported. We obtain a complete penetration weld devoid of undercut, crating at the top and minimum heat affected zone (HAZ) with a overlapping factor of 80–90% and heat input at 100–200 J/mm. The experimental settings prevailing inside the preferred region of the process window exhibit a higher tensile strength as well. |
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