In this work, we have analyzed the effect of heat treatment on the properties of steel specimens before and after welding under various heat treatment processes. Specimens were subjected to heat treatment in an electric muffle furnace. Heat treatment temperature, soaking time and cooling rate were selected as per phase diagram of specimen material. Specimens (before and after welding) were tested for mechanical properties before and after heat treatment. Different heat treatment processes compared with respect to their effect on the properties of single and welded specimens.