Kela-2 Gas Field is the main supply for the West-East Gas Pipeline which runs across China with length of 4000 kilometers. Natural gas from Kela-2 contains CO2/H2S sour components and 10% condensation water, which makes the medium present very strong corrosivity. In avoidance of corrosion failure, DSS SAF2205 line pipes were introduced to transmit the gas from the Gas Field to gathering center and processing factory. The DSS pipeline is totally about 13km and it is the first time DSS pipes were used largely amount in oil and gas pipeline around the world. As it is known, DSS SAF2205 pipes and traditional linepipes X65 were welded together between the gathering lines and mainline. Properties of welding joints, especially corrosion resistance, are very important for the safety of the pipeline. In this paper, the dissimilar metal joints were welded by Metal Inertia Gas Welding (MIG) with ER2209 electrodes to study and optimize welding procedure. Optical microscope, scanning electronic microscope and energy dispersive spectrometer (EDS) were employed to observe microstructure and analysis alloy elements distribution in the jointing zone between the dissimilar steels. Along the dissimilar joint, the microstructure changes from duplex characteristic combination of Ferrite and Austenite to that with Ferrite and a few Pearlite or MA. Smooth and notch tensile test and low temperature impact tests were also used to investigate mechanical properties of the dissimilar joints. Corrosion resistance of dissimilar metal joints were tested and analyzed. Weld metal produced with ER2209 presents excellent resistance to general corrosion in 1M NaCl solution. It is found that the ER2209 electrode is more suitable for producing the dissimilar weld joint according to this job.
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2008 7th International Pipeline Conference
September 29–October 3, 2008
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4859-3
PROCEEDINGS PAPER
Study on Dissimilar Metal Welding Between SAF2205 and X65 Pipes
Xiaoyan Wang,
Xiaoyan Wang
Tubular Goods Research Center of CNPC, Xi’an, China
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Lei Zhang,
Lei Zhang
University of Science and Technology-Beijing, Beijing, China
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Yalong Wang,
Yalong Wang
Tubular Goods Research Center of CNPC, Xi’an, China
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Minxu Lu
Minxu Lu
University of Science and Technology-Beijing, Beijing, China
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Xiaoyan Wang
Tubular Goods Research Center of CNPC, Xi’an, China
Lei Zhang
University of Science and Technology-Beijing, Beijing, China
Yalong Wang
Tubular Goods Research Center of CNPC, Xi’an, China
Minxu Lu
University of Science and Technology-Beijing, Beijing, China
Paper No:
IPC2008-64191, pp. 133-138; 6 pages
Published Online:
June 29, 2009
Citation
Wang, X, Zhang, L, Wang, Y, & Lu, M. "Study on Dissimilar Metal Welding Between SAF2205 and X65 Pipes." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 133-138. ASME. https://doi.org/10.1115/IPC2008-64191
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