PSI - Issue 68

Ibrahim R. Awad et al. / Procedia Structural Integrity 68 (2025) 1024–1030 Ibrahim R. Awad / Structural Integrity Procedia 00 (2025) 000–000

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4. Conclusions The S275JR structural steel was welded using two different processes, GTAW and SMAW, and the resulting microstructure and mechanical properties of the welded joints were analyzed. The key findings are summarized below. • The microstructure for both welded joints consists of acicular ferrite, ferrite, and pearlite, which develop during the solidification stage. • The hardness distribution in GTAW and SMAW welded joints varies due to differences in heat input, with GTAW showing a peak hardness of 286 HV in the HAZ and SMAW recording 275 HV in the FZ. The higher heat input in GTAW results in slower cooling rates, leading to distinct microstructure and hardness profiles compared to SMAW. • The SMAW joints exhibited higher tensile strength (532 MPa), and joint efficiency (98.8%) compared to GTAW joints, which recorded a tensile strength of 502 MPa and an efficiency of 93.2%. • Both welding methods resulted in fracture at the HAZ during tensile testing, highlighting the criticality of this zone in determining joint performance. The findings suggest that SMAW offers better tensile properties for S275JR steel, choosing welding techniques dependent on specific application requirements. Optimizing heat input and cooling rates for both methods could further enhance the performance of welded joints in industrial applications. References Arandjelovic, M., Djordjevic, B., Sedmak, S., Radu, D., Petrovic, A., Dikic, S., Sedmak, A., 2024. 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