Corrosion Properties of Weld Metal in 304 Stainless Steel for Food Grade Using GTAW with Various Types of Backing Gas
Issued Date
2024-01-01
Resource Type
ISSN
10139826
eISSN
16629795
DOI
Scopus ID
2-s2.0-85208501011
Journal Title
Key Engineering Materials
Volume
992
Start Page
61
End Page
68
Rights Holder(s)
SCOPUS
Bibliographic Citation
Key Engineering Materials Vol.992 (2024) , 61-68
Suggested Citation
Phuraya N., Phung-On I., Chaideesungnoen S., Tangsri T., Panmongkol P. Corrosion Properties of Weld Metal in 304 Stainless Steel for Food Grade Using GTAW with Various Types of Backing Gas. Key Engineering Materials Vol.992 (2024) , 61-68. 68. doi:10.4028/p-HT7twL Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/102043
Title
Corrosion Properties of Weld Metal in 304 Stainless Steel for Food Grade Using GTAW with Various Types of Backing Gas
Corresponding Author(s)
Other Contributor(s)
Abstract
This study investigated the impact from nitrogen content in backing gases on the microstructure and corrosion resistance of food grade stainless steel weld metal. Three types of backing gases were employed: 100%Ar, 85%Ar+15%N2, and 100%N2. Statistical analysis using ANOVA revealed a significant effect from nitrogen content on the ferrite phase fraction within the weld metal microstructures (p-value = 3.5E-05), indicating a reduction in the ferrite phase with increasing nitrogen content. Moreover, increasing nitrogen content positively shifted the pitting corrosion potential, indicating enhanced corrosion resistance. Optical microscopy confirmed lower pit density in samples with nitrogen backing gas as compared with samples with argon backing gas. These findings underscore the crucial role of nitrogen content in backing gases at influencing microstructure and corrosion resistance in stainless steel weld metal, with higher nitrogen levels correlated with improved corrosion resistance.