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J Weld Join > Volume 33(4); 2015 > Article
Journal of Welding and Joining 2015;33(4):37-43.
DOI: https://doi.org/10.5781/JWJ.2015.33.4.37    Published online August 31, 2015.
A Study of Characteristics on the Dissimilar Metals (STS 316L - Carbon Steel: ASTM A516-70) Welds made with GTAW
Se Cheol Kim*, Tae Woo Shin*, In Joon Moon**, Bok Su Jang***, Jin Hyun Koh*
Correspondence:  Jin Hyun Koh,
Email: jhkoh@kut.ac.kr
Abstract
Characteristics of dissimilar metal welds between STS 316L and carbon steel ASTM A516 Gr.70 made with GTAW have been evaluated in terms of microstructure, ferrite content, chemical analysis, hardness and corrosion resistance. Three heat inputs of 9.00, 11.25, 13.00kJ/cm were employed to make joints of dissimilar metals with ER309 wire. Based on microstructural examination, the amount of vermicular type of δ-ferrite was increased with increasing heat input due to the increase of Creq /Nieq in the second layer of welds. Based on the EDX analysis of weld metals, Cr and Ni content in the 2nd layer increased while those content in the first layer of welds decreased with heat inputs. Cellular solidification mode in the 1st layer and dendritic solidification mode in the 2nd layer due to different cooling rates were prevailed, respectively. Heat affected zone which formed hard microstructure showed higher hardness than the weld metal. The salt spray test of dissimilar metals weld joints showed that the carbon steel surfaces only corroded. The weight loss rate due to corrosion increased up to 100hours but it decreased above 100 hours. There was little difference in the weight loss caused by corrosion regardless of heat inputs.
Key Words: Dissimilar metals welding, GTAW, δ-ferrite, Vermicular ferrite, Corrosion, Heat input


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