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Technical Discussions
Satish
Satish
14:04 Oct-15-2016
Doubt in paut

Hi, is it practically possible to carryout paut on 1" Dia 3 mm thickness tube welds? If so, how?

 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 266

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
266
21:30 Oct-16-2016
Re: Doubt in paut
In Reply to Satish at 14:04 Oct-15-2016 (Opening).

It doesn't make much sense to use PAUT for thisn walled pipes. Phased array devices can show theit advantages in cases, where it is useful to change the beam direction and scan some area. In thin wall changing the direction of ultrasonic beam is not useful, since the beam diameter will be normally larger than 3 mm.

From my point of view the best solution is to use LCR waves (longitudinal, critically refracted - called also subsurface or creeping waves). This waves are travelling parallelö to the surface of the pipe. We have made some industrial systems based on this approach for testing welds in pipes with even smaller thickness. The sytems are working perfectly since years.

 
 Reply 
 
Anandh Perumal
India, Joined Jan 2015, 19

Anandh Perumal

India,
Joined Jan 2015
19
12:43 Oct-18-2016
Re: Doubt in paut
In Reply to Wieslaw Bicz at 21:30 Oct-16-2016 .

Please explain the longitudinal critically refracted waves with respect to first critical and second critical angle.

 
 Reply 
 

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