An attempt is made to sort out the effect of attenuation and beam skewing in the ultrasonic examination using normal beam on 75 mm thick austenitic stainless steel weldment a prime requisite as per the reference standard. The study involved use of different types of probes and probe applications in order to understand the effect of attenuation and beam skewing. The attenuation in 75 mm thick has been surprisingly quite high so as to cause lack of back wall echo even while using high gain setting in the conventional ultrasonic equipments. Also, it was brought to light that the defect delectability is very much hampered by the high degree of attenuation. With the 75 mm thick weld, our experience further shows that the gain requirement for receiving the back wall echo or the echo from side drilled holes of standard size, varies when scanned across the weld as compared to the parent material. This calls for a new approach in the setting up of calibration standards for acceptance of the weld. The paper details out all the study data and spells out the conclusion.