Yohanes, Y., & 		Meipen, M.
(2022).
 Effect of Rotational Speed on Hardness Value and Area of Vertical Bar-Plate Rotary Friction Weld Joint.
<em>Journal Of Ocean, Mechanical And Aerospace -Science And Engineering-, 66</em>(3), 77-81.
doi:10.36842/jomase.v66i3.327