Properties and structure of the weld joints of quench and tempered 4330V steel

This work outlines the research on welding of heat treated 4330V steel using the flux core arc welding process. The research describes the effect of preheat temperature, interpass temperature, heat input, and post weld heat treatment on strength, hardness, toughness, and changes of microstructure in the weld joint. Welding with the lower heat input and without post weld heat treatment results in optimal mechanical properties in the weld metal. Austempering at 400 °C results in optimal mechanical properties in the heat affected zone (HAZ). Increasing preheats and interpass temperature from 340 to 420 °C did not improve Charpy V-notch values or ultimate tensile strength in the weld metal or heat affected zones.