Semi-automatic MAG welding of alloyed machine-building steels

  • 1 Technical University of Varna, Department of Materials Science and Technology, Varna, Bulgaria
  • 2 Technical University of Varna, Department Thermal Engineering, Varna, Bulgaria


The present study explores the possibility of semi-automatic MAG welding of three steels with carbon equivalents of 0,40%, 0,50% and 0,60%. The impact of the welding speed on the crack formation is determined by a structural analysis of the TIZ (Thermal Impact Zone). A three-factor experiment was conducted to determine the impact of the factors on the obtained hardness in the TIZ. The regression equation was obtained and the isolines were outlined showing the impact of these factors


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