Effects of Autogenous Gas Tungsten Arc Welding (GTAW) on Corrosion Resistance of Stainless Steel 316L

The autogenous manual gas tungsten arc welding (GTAW) process was used for cladding austenitic stainless steel 316L using a single pass with various contact tip-to-work distances (CTWDs). Immersion and electrochemical tests were used to evaluate the corrosion resistance of the welded specimens, and...

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Bibliographic Details
Published in:Processes 2024-08, Vol.12 (8), p.1757
Main Authors: Song, Inyoung, Gwang-Ho Jeong, Sang-Kyo, Kim, Kim, Yun Hwan, Murphy, Anthony B, Park, Tae-Kook, Kim, Ducklae, Park, Hyunwoo, Dae-Won, Cho
Format: Article
Language:English
Subjects:
Arc resistance heating
Austenitic stainless steels
Austenitizing
Cameras
Chemical composition
Corrosion
Corrosion effects
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Electrodes
Ferrite
Gas tungsten arc welding
Gases
Hardness
Heat affected zone
Immersion tests (corrosion)
Marangoni convection
Mechanical properties
Microstructural analysis
Microstructure
Optimization
Plasma
Shape effects
Stainless steel
Stress concentration
Surface hardness
Temperature
Tungsten
Weld metal
Welding
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Summary:The autogenous manual gas tungsten arc welding (GTAW) process was used for cladding austenitic stainless steel 316L using a single pass with various contact tip-to-work distances (CTWDs). Immersion and electrochemical tests were used to evaluate the corrosion resistance of the welded specimens, and a microstructural analysis was conducted to investigate the chemical composition of the molten pool and the heat-affected zone of welding. The key findings of this study indicate that the corrosion resistance improved under a CTWD of 5 mm due to the optimal distribution of ferrite and a refined microstructure. Additionally, the highest hardness was observed in specimens with a CTWD of 3 mm, attributed to the increased ferrite content in the weld metal. As the CTWD increased, the ferrite fraction decreased, and the hardness also diminished. However, in the CTWD 7 mm case, the higher heat input influenced the microstructure and molten pool shape significantly through the Marangoni effect, resulting in a lower corrosion resistance. These results suggest that optimizing the CTWD can enhance the corrosion resistance of welded 316L stainless steel.
ISSN:2227-9717
DOI:10.3390/pr12081757