Studies on corrosion protection of laser hybrid welded AISI 316 by laser remelting

Flemming Ove Olsen, Rajan Ambat, A.J. Rasmussen

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Abstract

Unlike in autogenous laser welding, hybrid laser welding of stainless steel could introduce grain boundary carbides due to low cooling rates. Formation of grain boundary carbides leads to reduced corrosion properties. Studies have initially been carried out on hybrid laser welding and subsequent laser surface melting on microstructure and corrosion behaviour of AISI 316L welds. Welding and laser treatment parameters were varied. General corrosion behaviour of the weld and laser treated surface was characterised using a gel visualization test. The local electrochemistry of the weld and laser treated surface was investigated using a novel micro electrochemical technique with a tip resolution of ~1 mm. Results show that hybrid laser welding of 316L has increased corrosion susceptibility probably as a result of grain boundary carbide formation. However a suitable post laser treatment could regain the corrosion resistance by desensitization.
Original languageEnglish
Title of host publicationStudies on corrosion protection of laser hybrid welded AISI 316 by laser remelting
Publication date2005
Publication statusPublished - 2005
Event10th Nordic Laser Materials Processing Coference - Luleå University of Technlogy, Luleå, Sweden
Duration: 17 Aug 200519 Aug 2005
Conference number: 10

Conference

Conference10th Nordic Laser Materials Processing Coference
Number10
LocationLuleå University of Technlogy
CountrySweden
CityLuleå
Period17/08/200519/08/2005

Cite this

Olsen, F. O., Ambat, R., & Rasmussen, A. J. (2005). Studies on corrosion protection of laser hybrid welded AISI 316 by laser remelting. In Studies on corrosion protection of laser hybrid welded AISI 316 by laser remelting