A COMPARATIVE STUDY ON DESIGN AND MANUFACTURE OF ULTRASONIC IMMERSION TESTING FIXTURE

In this paper an effort has been made to study comparatively the existing ultrasonic immersion-testing fixture with the newly designed and manufactured ultrasonic immersion-testing fixture. The comparisons are made from the design, manufacturing and operational point of views. Finally it is concluded that the operational performance as well as the accuracy of the measurement achieved in the new fixture is far better than that of the existing one. In the existing ultrasonic immersion-testing fixture, scanning over the test specimen is done by the "X-Y" bridge type scanner. The bridge is positioned on the scanning tank and the specimen is immersed into the water. But both these X and Y-axes movement are not accurate because there is always a chance of displacement of wheels at the time of experiment. To overcome these difficulties testing fixture with rack and pinion arrangement is made. Here the total fixture is attached to the tank. The X and Y axis movement is given by rack and pinion so that high accuracy may be obtained during the detection of material flaws. In this case percentage error during measuring the depth and length of the material flaw is much lesser than that with the existing one.