NDLI: Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

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Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

Content Provider	MDPI
Author	Kim, Du-Song Lee, Hee-Keun Seong, Woo-Jae Lee, Kwang-Hyeon Bang, Hee-Seon
Copyright Year	2021
Description	The International Maritime Organization has recently updated the ship emission standards to reduce atmospheric contamination. One technique for reducing emissions involves using liquefied natural gas (LNG). The tanks used for the transport and storage of LNG must have very low thermal expansion and high cryogenic toughness. For excellent cryogenic properties, high-Mn steel with a complete austenitic structure is used to design these tanks. We aim to determine the optimum welding conditions for performing Laser-MIG (Metal Inert Gas) hybrid welding through the MIG leading and laser following processes. A welding speed of 100 cm/min was used for welding a 15 mm thick high-Mn steel plate. The welding performance was evaluated through mechanical property tests (tensile and yield strength, low-temperature impact, hardness) of the welded joints after performing the experiment. As a result, it was confirmed that the tensile strength was slightly less than 818.4 MPa, and the yield strength was 30% higher than base material. The low-temperature impact values were equal to or greater than 58 J at all locations in the weld zone. The hardness test confirmed that the hardness did not exceed 292 HV. The results of this study indicate that it is possible to use laser-MIG hybrid welding on thick high-Mn steel plates.
Starting Page	604
e-ISSN	20771312
DOI	10.3390/jmse9060604
Journal	Journal of Marine Science and Engineering
Issue Number	6
Volume Number	9
Language	English
Publisher	MDPI
Publisher Date	2021-05-31
Access Restriction	Open
Subject Keyword	Journal of Marine Science and Engineering Manufacturing Engineering Marine Engineering High-mn Steel Laser-mig Hybrid Welding Cryogenic Tank Humping Defect Low-temperature Impact Test
Content Type	Text
Resource Type	Article

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