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12:48 Aug-13-2009

gowrishankar

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
phased array UT

HAS ANY BODY TRIED TO TEST 5MM THICK STEEL WELDS BY PHASED ARRAY TECHNIQUE ?
IS IT POSSIBLE TO DETECT AMS "F" NOTCH (1.2MM EQUIVALENT DEFECT)


    
 
13:37 Aug-13-2009
J Mark Davis
Re: phased array UT In Reply to gowrishankar at 12:48 Aug-13-2009 (Opening).

Phased Array at this thickness should not be a problem if the proper PA Probe is used.

I have used an Olypmus A00 designed probe of 10L16, (10 Mhz with 16 elements) on materials about .187 wall. And, that was in Titanium.

What materials are you inspecting? If carcbon Steel this should be very easy. SS may be a problem depending on grain size.

The notch depth you mentioned should not be a problem either. I have used Phased Array to detect EDM notches of .020 and less.

I know Olympus has techniques for notches smaller than 1/2 mm.

The best thing to do is try a few frequencies and probe types, 16 elements, 32 elements, etc.


    
 
09:09 Aug-14-2009

gowrishankar

R & D, scientist
ISRO,
India,
Joined Nov 2008
34
Re: phased array UT In Reply to J Mark Davis at 13:37 Aug-13-2009 .

thank you for your valuable comments.
my material is maraging steel M250.what is comment on M250 testing feasibility?WE are using titanium pure material also.
regards
gowrishankar


    
 
13:42 Aug-14-2009
J. Mark Davis
Re: phased array UT In Reply to gowrishankar at 12:48 Aug-13-2009 (Opening).

zoom image[zoom]

To demonstrate the sensitivity and detectability using Phased Array, I scanned one of my Phased Array calibration plates.

I used a 5L16 focused at .800 inches in depth with an Omniscan 32/128.

First image is a wire EDM notch (.005 inch width) and a depth of 1 % of a 1 inch thick carbon steel plate. The actual depth is 0.010 or about .25 mm.

Second image is a 1/2 of 1% at at depth of .005 inches (.125 mm)

So, for the values you mentioned, you should not have a problem using Phased Array. Of course, this has to be demonstrated using an appropriate calibartion block of the known material.

    
 


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