This research investigates the impact of friction stir welding (FSW) used to join
micro-alloyed steel, on the material and its mechanical characteristics. FSW
increases the metallurgical and mechanical qualities of joints made from
micro-alloyed steel. However, Friction Stir Welding has produced only modest
improvements in connecting steels. Automobile chassis, offshore platforms, oil
and gas pipelines, mining, shipbuilding and railroad carriages, pressure
vessels, bridges, and storage tanks are just some of the many places and find
micro-alloyed steels employed. Frictional heat and tool movement over the joint
cause micro defects occurred. Tungsten carbide tools are used in this
investigation. Welding shares the same process characteristics, such as the
tool's rotating speed (900 rpm) and axial force (10 kN). The table's traverse
speed options are available, including 50 mm/min, 60 mm/min, and 70 mm/min.
Vickers microhardness testing machines and tensile testing machines are used to
perform mechanical characterizations such as hardness testing and tensile
testing, respectively. Charpy testing was used to analyze the impact energy
released during the fracture of the welded joint. The Scanning Electron
Microscope (SEM) and Optical Microscope are used for metallurgical
characterizations such as microstructure and tensile fracture research. DMR-249A
is low-carbon micro-alloyed steel, and it is a far better grade than the
multiple grades that have previously been used for naval and other industrial
uses like shipbuilding, railway car construction, etc.