Journal
WELDING IN THE WORLD
Volume 67, Issue 3, Pages 819-830Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40194-022-01442-x
Keywords
Gas metal arc welding; No-backing gas welding; Stainless steel; Pitting corrosion
Categories
Ask authors/readers for more resources
In this study, the pitting corrosion behavior of 304L austenitic stainless steel during no-backing gas (NBG) welding using waveform-controlled gas metal arc welding (GMAW) was investigated. The results showed that the NBG welds had similar pitting corrosion resistance as compared to reference welds made with backing gas, but with a slightly lower pitting potential.
Stainless steel pipe welds for service applications in corrosive environments typically use gas tungsten arc welding (GTAW) and require the use of an inert backing gas in order to minimize or prevent root bead contamination and oxidation. This adds significant cost and complexity to the welding of stainless steel pipe due to access restrictions, personnel safety, and/or economic factors. In this work, waveform-controlled gas metal arc welding (GMAW) was used for no-backing gas (NBG) welding of Type 304L austenitic stainless steel. Pitting corrosion behavior locally in the backside heat-affected zone and root bead weld metal was characterized using a syringe cell setup for cyclic potentiodynamic polarization (CPP) measurements. The CPP results indicate that the NBG welds have a similar pitting corrosion resistance as compared to reference GTAW and GMAW welds made with pure argon purging and an argon-oxygen mixture backing gas. The repassivation potential of the NBG welds was comparable to the reference welds, while the pitting potential was slightly lower. Weld bead appearance, weld metal ferrite, and heat tint oxidation were also characterized, and discussed with regard to the observed pitting corrosion resistance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available