Heat treatment is an important operation in the final fabrication process of many engineering machinery. Only by heat treatment it is potential to impart high mechanical properties to steel parts & tools for sophisticated purpose. Heat treatment is considered to be very important tool of the metallurgist by which it can alter the properties of steel easily. Post weld heat treatment temperature influences the properties of weldment which directly affect the weld joints strength. Improve weld joint strength increase the structure integrity of weldment so it�s important to understand the effect of different post weld heat treatment temperature on weldment. This study aimed at the investigation of the effect of pre-heating on the mechanical & microstructure properties of weldment
