Re: Ultrasonic angle beam formula for cylindrical forgings.  Start Original Message  : I would like to know the formula for proper angle use to impinge id of thick wallcylindrical forgings/pipe.  End Original Message 
SinØ 1 = (ID/OD) * SinØ2 SINØ2 being the desired angle on the ID surface.
Re: Ultrasonic angle beam formula for cylindrical forgings.  Start Original Message  : I would like to know the formula for proper angle use to impinge id of thick wallcylindrical forgings/pipe.  End Original Message 
Many years ago I found some useful formulas in Materials Evaluation No. 43, November 1985, page 1489. This was published under the heading 'NDT Solutions' by Jim Johnson.
If you are interested contact me directly via email and I can send you a PDF copy.
01:42 Jul152005 N.DHANASEKARAN R & D WELDING RESEARCH INSTITUTE, BHEL, India, Joined Jun 2005 ^{3}
Re: Ultrasonic angle beam formula for cylindrical forgings.
Hello! Well known formula to calculate the penetrated depth (d) by angle beam (¥è), knowing outer radius(r) of the pipe is given below:
d = r (1 sin¥è)
By substituting the thickness of the pipe in place of "d", for full penetration by the sound beam, one can calculate the angle required. For example , 25 mm thick pipe of radius 100 mm will require 45 degree angle probe to detect inner notch in the ref.pipe. N.DHANASEKARAN

 Start Original Message  : : I would like to know the formula for proper angle use to impinge id of thick wallcylindrical forgings/pipe. : Sin¨ª 1 = (ID/OD) * Sin¨ª2 : SIN¨ª2 being the desired angle on the ID surface. : Sorry misprint.  End Original Message 