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International Journal of Corrosion
Volume 2018, Article ID 7284246, 11 pages
https://doi.org/10.1155/2018/7284246
Research Article

Twin-Wire Pulsed Tandem Gas Metal Arc Welding of API X80 Steel Linepipe

College of Mechanical and Electrical Engineering, China University of Petroleum, East China, Qingdao, Shandong, China

Correspondence should be addressed to Ming Zhao; nc.ude.cpu@80gnimoahz

Received 12 December 2017; Accepted 5 February 2018; Published 11 March 2018

Academic Editor: Jerzy A. Szpunar

Copyright © 2018 Wenhao Wu et al. 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.

Abstract

Twin-Wire Pulsed Tandem Gas Metal Arc Welding process with high welding production efficiency was used to join the girth weld seam of API X80 steel linepipe of 18.4 mm wall thickness and 1422 mm diameter. The macrostructure, microstructure, hardness, and electrochemical corrosion behavior of welded joints were studied. Effects of temperature and Cl concentration on the corrosion behavior of base metal and weld metal were investigated. Results show that the welded joint has good morphology, mechanical properties, and corrosion resistance. The corrosion resistance of both the base metal and the weld metal decreases with increasing temperature or Cl concentration. In the solution with high Cl concentration, the base metal and weld metal are more susceptible to pitting. The corrosion resistance of the weld metal is slightly lower than that of the base metal.