Microstructural Evolutions of Weld Metal in SAE۱۰۸۰ Steel

A permanent connection like a welding joint is very important in various industries. The metallurgical microstructure is one of the important characteristics of weld metal. Due to the strong influence of microstructure on the development of mechanical properties, microstructural evolutions of weld metal have always been of interest to researchers. The CO۲ arc welding process has many applications in various industries. The effect of welding parameters, including arc voltage (V) (۲۳, ۲۵, and ۲۷ V), welding current (I) (۱۰۰, ۱۱۰, and ۱۲۰ A), and welding speed (S) (۴۲, ۶۲, and ۸۲ cm/min) on microstructural evolutions of the weld metal in SAE۱۰۸۰ steel was evaluated in this paper. The results clearly showed that the microstructure of the weld metal in all tests was mainly composed of retained austenite (RA), martensite (M), and tempered martensite (TM) phases, and changing each of the welding parameters had a significant effect on the volume fraction and morphology of phases

کلیدواژه ها:

CO۲ arc welding process ، welding parameters ، weld metal ، microstructure ، SAE۱۰۸۰ steel.