The Influence of Post-Weld Heat Treatment on High-Pressure Vessel Steel ASTM A285 Grade C with Gas Metal Arc Welding Process
Keywords:
Gas Metal Arc Welding, Post Weld Heat Treatment, Microstructure, Hardness TestAbstract
The objectives of this research were to study the influence of post-weld heat treatment of high-pressure vessel steel ASTM A285 Grade C with a gas metal arc welding process on its hardness and microstructure of the Weld Metal (WM) and Heat-Affected Zone (HAZ). The high-pressure vessel steel ASTM A285 Grade C in a sheet thickness of a 4 mm welding were performed by gas metal arc welding robot arcing. The welding samples were attempted to be joined with a butt joint. Then, the post-weld heat treatment (stress relieve process) was continued at 520, 570, and 670 degrees Celsius for 30 and 60 min in each temperature level compared with as-weld specimens. After that, optical microscopy and hardness were tested by using the Vickers hardness method. The result showed that temperature and time in the stress relieve process had a significantly affected on hardness in WM and HAZ (p˂0.05). The WM and HAZ microstructures of stress relieved specimens were pearlite, Acicular ferrite, and Widmanstatten ferrite which showed coarser grain than as-weld specimens.
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