A focused high frequency shear wave is directed to the weld zone from half skip distance to detect lack of fusion, porosities and wall cracks in the weld zone. Incidence angle was optimized such that the shear beam falls perpendicularly on the weld line to achieve maximum concitivity of defect detection. It is found advantageous to test the weld without machining the outer weld upset. Outer upset is used for quick positioning of the weld during inspection. Select/reject level has been evolved to sort out the defective weld by examining more than 700 PHWR fuel pin welds produced at AFFF, Tarapur, RMD, BARC and NFC, Hyderabad. The testing technique is amenable for easy automation. Using two probes simultaneously, even in manual mode, speed of testing is sufficient to match the production speed for sorting out the defective welds. Testing was demonstrated to inspectors at Nuclear Fuel Complex, Hyderabad. The technique can be used for welding machine qualification from the first weld produced by the machine. This paper discusses in detail the ultrasonic testing technique developed at Radiometallurgy Division, Bhabha Atomic Research Centre.