Simorangkir, M., 		Yohanes, Y., & 		Badri, M.
(2023).
 Effect of Spindle Speed of Bar-Plate Rotary Friction Welding Machine on Joint Interface Area and Hardness Value.
<em>Journal Of Ocean, Mechanical And Aerospace -Science And Engineering-, 67</em>(1), 34-39.
doi:10.36842/jomase.v67i1.322