Influence of the Weld Heat Input on the Electrochemical Behavior of the 921A High Strength Steel Welding Joints

Abstract:

Using the prepared gas-shielded flux-cored wire for welding 600MPa high strength steel, the 921A high strength steels were welded at different weld heat input condition of 10 kJ/cm, 15 kJ/cm and 20 kJ/cm. The influence of weld heat input on the electrochemical behavior of the 921A high strength steel welding joints were studied in this paper. The results show that, at different weld heat input condition, the linear polarization resistances (LPR) of all the welding joints welded by using the prepared flux-cored wire were close to that of the 921A base steel, as can be identified as the same LPR value at 15 kJ/cm weld heat input condition. By observing the surfaces of the linear polarized welding joints samples, it was found that the welding joint at 15 kJ/cm weld heat input had the smallest corrosive area by macro observing, showing the pitting corrosion by micro observing and presents the least corrosion pit.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 312-318
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.312
• Online since: April 2015
• Authors: Kai Wang*, Jiang Long Yi, Shi Da Zheng, Chun Fu Guo, He Xin Chen, Lei Xu
• Keywords: Electrochemical Behavior, High Strength Steel, Microstructure, Weld Heat Input

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