EFE, H., V. . ONAR, and M. G. . ÇINAR. “THE EFFECT OF WELDING CURRENTS ON MICROSTRUCTURES IN WELDING OF S690QL SERIES STEELS IN USED HEAVY DUTY MACHINES”. Ejons International Journal on Mathematic, Engineering and Natural Sciences, vol. 3, no. 7, Feb. 2019, pp. 123-30, https://ejons.org/index.php/ejons/article/view/402.