Effect of pressure and shielding gas on the microstructure of hyperbaric metal cored GMAW welds down to 111 bar

Conference · Sun Dec 31 00:00:00 EST 1995

OSTI ID:205443

Jorge, J C.F. ^[1]; Santos, V.R. dos ^[2]; Santos, J.F. dos ^[3]

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1. CEFET, Rio de Janeiro (Brazil). Mechanical Engineering Dept.
2. Petrobras/CENPES, Rio de Janeiro (Brazil)
3. GKSS Forschungszentrum Geesthacht GmbH (Germany)

The microstructural evolution of hyperbaric C-Mn weld metals was studied by means of bead-on-plate welds deposit with GMAW process using a commercial metal cored wire. The welding was carried out in the flat position in the range of 51 bar to 111 bar with He+ CO{sub 2} as shielding gas, which CO{sub 2} content varied from 0.1% to 0.8 %. The microstructures were quantitatively analyzed by optical microscopy to evaluate the amount of constituents according to the IIW/IIS terminology. The results showed that all weld metals presented great amounts of acicular ferrite and a stronger influence of pressure on microstructure compared to the influence of the shielding gas.

• OSTI ID: 205443
• Report Number(s): CONF-950695-; ISBN 0-7918-1309-6; TRN: IM9615%%223
• Resource Relation: Conference: International conference on offshore mechanics and arctic engineering, Copenhagen (Denmark), 18-22 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of OMAE 1995 -- Proceedings of the 14. international conference on offshore mechanics and arctic engineering. Volume 3: Materials engineering; Salama, M.M. [ed.] [Conoco, Inc., Ponca City, OK (United States)]; Toyoda, Masao [ed.] [Osaka Univ., Suita, Osaka (Japan)]; Liu, S. [ed.] [Colorado School of Mines, Golden, CO (United States)]; Santos, J.F. dos; Kocak, M. [eds.] [GKSS, Geesthacht (Germany)]; Patterson, E.A. [ed.] [Univ. of Sheffield (United Kingdom)]; Berge, S. [ed.] [Univ. of Trondheim (Norway)]; Stacey, A. [ed.] [Health and Safety Executive, London (United Kingdom). Offshore Safety Div.]; PB: 600 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
WELDED JOINTS
MICROSTRUCTURE
OFFSHORE PLATFORMS
STEELS
SHIELDED METAL-ARC WELDING
PIPELINES
CHEMICAL COMPOSITION
UNDERWATER OPERATIONS
REMOTE CONTROL
RESEARCH PROGRAMS
MATERIALS TESTING