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http://dx.doi.org/10.5916/jkosme.2012.36.8.1076

Comparison on Autogenous Weldability of Stainless Steel using High Energy Heat Source  

Kim, Jong-Do (한국대학교 기관공학부)
Lee, Chang-Je (BEST F.A 기술연구소)
Song, Moo-Keun (한국해양대학교 대학원)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.36, no.8, 2012 , pp. 1076-1082 More about this Journal
Abstract
Today the welding for LNG carrier is known to be possible using arc and plasma arc welding process. But because of the lower energy density, arc welding is inevitable to multi-pass welding for thick plate and has a limit of welding speed compared to laser which is high energy density heat source. When thick plate is welded, weld defect by multi-pass welding and heat-affected zone by high heat-input were formed. Therefore one-pass welding by key-hole has been considered to work out the problems. It is possible for Laser, electron beam, plasma process to do key-hole welding. Nowadays, plasma process has been used for welding membrane of cargo tank for LNG carrier instead of arc process. Recently, many studies have examined to apply laser process to welding of membrane. In this paper, weldability, microstructure and mechanical properties of stainless steel for LNG carrier welded by fiber laser were compared to those by plasma. As a result, although the laser welding has several times faster speed, similar properties and smaller weld and heat affected zone were obtained. Consequently, this study proves the superiority of fiber laser welding for LNG carrier.
Keywords
High energy heat source; Plasma arc; Membrane; One-pass welding;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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