The fast changing economic conditions customer demand for high quality product, product variety and reduced lead–time etc. had a major impact on manufacturing industries to improve the quality performance rate. An analysis being performed using advanced technology Phased Array Ultrasonic Testing on fusion welded low alloy steels to extract flaws from nondestructive testing (NDT). Our goal is to extend the previous study and enable us to detect flaws with images successfully so that the usability of our technique is extended and verified in experiment. A number of defects are being observed in the welding process and can be differentiate very easily. Defects in welding may be found out in two methods, i.e. by Radiographic Tests and by Phased Array Ultrasonic Tests. This paper discusses the feasibility of advanced NDT technique and other related methods.