I wrote a program that gives a simple simulation of the Ultrasonic testing process. Its not fancy but may be of use to somebody. It can be downlaoded at http://www.weldinginspectionsvcs.com/UTDemoDownload.htm
It was written in Visual Basic 5.0 and should run on most machines. I program for a hobby and for what I need at work so don't expect much.
Feel free to criticize though. Any of you UT people let me know if the thing is semi accurate.
Have a nice day
Gerald Austin