Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 40, Issue -, Pages 140-148Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2019.03.017
Keywords
LNG; 9% nickel steel; Welding productivity; Super-TIG welding; Alloy 625; C-Filler; TIG
Categories
Funding
- Pukyong National University
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The demands for liquefied natural gas and 9% nickel steel tanks for its storage have increased due to stricter regulations for ship emissions. In the present study, a super-TIG welding process was developed for the butt welding of 9% nickel steel by using Alloy 625 filler metal with a C-type cross-section. The mechanical properties of the welded specimens were compared with those of flux-cored arc welding, using Hastelloy and Alloy 600 filler metals in impact and tensile tests, while the structures were examined under an optical microscope. The newly developed super-TIG welding process was shown to have an effective heat input ratio, given that hot cracking does not occur.
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