Effect of pressure and shielding gas on the microstructure of hyperbaric metal cored GMAW welds down to 111 bar
Conference
·
OSTI ID:205443
- CEFET, Rio de Janeiro (Brazil). Mechanical Engineering Dept.
- Petrobras/CENPES, Rio de Janeiro (Brazil)
- 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
- Country of Publication:
- United States
- Language:
- English
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