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.
Highlights
API X80 pipeline steel offering super high strength and high toughness is widely used in the petrochemical industry [1]
High weld quality and high production efficiency are two essential requirements. These requirements are hardly fulfilled in the welding of girth weld seam of API X80 steel pipe using conventional gas metal arc welding (GMAW) process with single-wire and multilayer [6]
The multiwire Pulsed Tandem Gas Metal Arc Welding (PT-GMAW) process has the potential to overcome the above problems while meeting both aforesaid requirements [7,8,9]
Summary
API X80 pipeline steel offering super high strength and high toughness is widely used in the petrochemical industry [1]. High weld quality and high production efficiency are two essential requirements. These requirements are hardly fulfilled in the welding of girth weld seam of API X80 steel pipe using conventional gas metal arc welding (GMAW) process with single-wire and multilayer [6]. The study of welding technology and corrosion resistance of longitudinal or circumferential welds of high strength and high toughness steel pipelines is one of the current hotspots. This work is expected to hold significant theoretical and practical importance in the petrochemical industry
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