Mechkarova T, Ucherdzhiev A, Valchev N, Mincheva D. Investigationof tribological characteristics of 40Xgradesteel after hardfacedMMA welding method [Internet]. ANNUAL JOURNAL OF TECHNICAL UNIVERSITY OF VARNA, BULGARIA [Internet]. 30Sep.2024 [cited 18Aug.2025];8(2):1-. Available from: http://194.141.24.9/index.php/ajtuv/article/view/312