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Metals 2016, 6(9), 207; doi:10.3390/met6090207

The Electrochemical Investigation of the Corrosion Rates of Welded Pipe ASTM A106 Grade B

1
Department of Materials Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Rd., Ladyao, Chatuchak, Bangkok 10900, Thailand
2
Center of Welding Engineering and Metallurgical Inspection, Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, 1518, Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
3
Department of Welding Engineering and Technology, College of Indrustrial Technology, King Mongkut’s University of Technology North Bangkok, 1518, Pracharat 1 Road, Wongsawang, Bangsue, Bangkok 10800, Thailand
4
Thai-French Innovation Institute, King Mongkut’s University of Technology North Bangkok, Bangsue, Bangkok 10800, Thailand
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 6 July 2016 / Revised: 9 August 2016 / Accepted: 15 August 2016 / Published: 31 August 2016
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Abstract

The aim of this work was to investigate the corrosion rate of welded carbon steel pipe (ASTM (American Society for Testing and Materials) A106 Grade B) by GTAW under the currents of 60, 70, and 80 A. All welded pipes satisfied weld procedure specifications and were verified by a procedure qualification record. The property of used materials was in agreement with the ASME standard: section IX. The welded pipe was used for schematic model corrosion measurements applied in 3.5 wt % NaCl at various flow rates and analyzed by using the electrochemical technique with Tafel’s equation. The results showed the correlation between the flow rate and the corrosion rate of the pipe; the greater the flow rate, the higher corrosion rate. Moreover, the welded pipe from the welding current of 70 A exhibited higher tensile strength and corrosion resistance than those from currents of 60 and 80 A. It indicated that the welding current of 70 A produced optimum heat for the welding of A106 pipe grade B. In addition, the microstructure of the welded pipe was observed by SEM. The phase transformation and crystallite size were analyzed by XRD and Sherrer’s equation. The results suggested that the welding current could change the microstructure and phase of the welded pipe causing change in the corrosion rate. View Full-Text
Keywords: carbon steel pipe; GTAW; corrosion carbon steel pipe; GTAW; corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yingsamphancharoen, T.; Srisuwan, N.; Rodchanarowan, A. The Electrochemical Investigation of the Corrosion Rates of Welded Pipe ASTM A106 Grade B. Metals 2016, 6, 207.

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