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- Title
Distortions in Large Stiffened Ship Panels Caused by Welding: An Experimental Study.
- Authors
Podder, Debabrata; Das, Sreekanta; Mandal, Nisith R.
- Abstract
Severe distortions are observed in fabrication of large stiffened ship panels using lower thickness plates ranging from 3mmto 10 mm. It requires expensive postwelding fairing operations. It is naturally preferable to control the distortion during fabrication than to apply fairing operations. Welding sequence plays an important role in controlling distortion. The aspect of weld sequencing has been studied only on a small and extremely simple form of test models. Possible welding sequences were worked out, based on principles of heat balancing or heat accumulation and subsequent behavior of such panels. Based on this, large stiffened panels were fabricated using low carbon steel of shipbuilding quality considering four different welding sequences. Initial and final distortions of these panels were measured using high precision coordinate measuring machine. In this investigation, experiments and measurements played a very important role, as numerical simulation of such large panels would have been prohibitively expensive or not feasible. This study established the pattern of welding sequence that needs to be followed for minimizing welding distortion in the fabrication of large stiffened panels. Gainful conclusions were drawn to give directions to welding designers to work out the appropriate sequence of welding to minimize the weldinduced panel distortions.
- Subjects
MILD steel; WELDING equipment; COORDINATE measuring machines; SUBMERGED arc welding; WELDED joints
- Publication
Journal of Ship Production & Design, 2019, Vol 35, Issue 3, p250
- ISSN
2158-2866
- Publication type
Article
- DOI
10.5957/JSPD.180019