Corrosion characteristics, microstructure, and mechanical properties of welding of 304SS/308LSS/304SS using GTAW.

Elsayed, Ahmed G; AbdelFatah, Aliaa; El-Kashif, Emad F; Mohamed, Lamiaa Z; Abdelkawy, Abdallah A

doi:10.21608/ejchem.2024.258625.9098

Corrosion characteristics, microstructure, and mechanical properties of welding of 304SS/308LSS/304SS using GTAW.

Document Type : Original Article

Authors

¹ Department of Mechanical Design and Production, Faculty of Engineering, Cairo University, 12613, Egypt.

² Metallurgical Dept, Faculty of Engineering, Cairo University

³ Department of Mechanical Design and Production, Faculty of Engineering, Cairo University, 12613, Egypt

⁴ Mining, Petroleium, Metallurgical Engineering Dept., Faculty of Engineering, Cairo Univerrsity

⁵ Department of Mechanical Design and Production in Faculty of Engineering, Cairo University, Egypt

10.21608/ejchem.2024.258625.9098

Abstract

The gas tungsten arc welding (GTAW) method is used with different parameters to join 304SS, 308LSS, and 304SS. welding speed and gas flow rate effects on the characterization of the three welding samples were studied. Optical microscopy (OM) and scanning electron microscopy (SEM) were used to look at the base materials (BM), the heat-affected zone (HAZ), and the welding materials (WM). The tensile strength and hardness were studied for the different welding conditions. The 304SS/308LSS/304SS welding corrosion behavior was examined. The potentiodynamic polarization of the three welding conditions in 3.5% NaCl was investigated. The weld region in the low heat input sample has the lowest CR value (2.140 mm/yr), while the HAZ region in the high heat input sample has the lowest CR value (0.29 mm/yr). The SEM investigated the morphology of the three corroded welding conditions. It was found that the welding parameters had an impact on the average pit size of the corroded samples. The HAZ region in the high heat input sample has the lowest average pit size (0.329 µm).

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