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Technical Discussions
Govindraj
Govindraj
09:16 Nov-02-2018
PAUT on 5 mm thickness P265GH

can we inspect 5 mm thickness P265GH material with 5 Mhz A32 Probe.

ref scan on flat iso 13588 ref block

 
 Reply 
 
J Mark Davis
Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama, USA, Joined Mar 2000, 85

J Mark Davis

Teacher, And Consultant
University of Ultrasonics, Birmingham, Alabama,
USA,
Joined Mar 2000
85
13:20 Nov-02-2018
Re: PAUT on 5 mm thickness P265GH
In Reply to Govindraj at 09:16 Nov-02-2018 (Opening).

Yes, you can, but you might consider going to 10 MHZ. It depends on the critical flaw size. Generally, with Conventional UT you see about 1/2 wavelength in theory. I believe with Phased Array we are at about 1/10 wavelength.

I have effectively examined 1 mm thicknesses (.040 inches) using PA at 10 MHZ and detected a .0005 inch deep EDM notch with a 6 to 1 S/N ratio.

J Mark Davis
Veriphase, Inc.

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
15:38 Nov-02-2018
Re: PAUT on 5 mm thickness P265GH
In Reply to Govindraj at 09:16 Nov-02-2018 (Opening).

Govindraj, if there are no geometric restrictions, it is of course a physical possibility that you could detect small flaws in thin wall joints. But the physical possibility may not be the issue in this case. The material you quoted is a standard pressure vessel steel so coarse-grain concerns are not an issue. But you quoted use of a flat reference block as per ISO 13588. The blocks identified in ISO 13588 are in the "Informative" Annex and there are 3 blocks, all examples are flat. Selection of the blocks is based on Table 4 which instructs you to base selection on the Testing Level. Procedure qualification is also required if you are required to test in accordance with Testing Levels B, C or D.
But when we look at the Scope of ISO 13588, we see it applies to fusion joints in steel with minimum thickness of 6mm. The Tables A1 and A2 indicate that they apply to thicknesses GREATER than 6mm. To work on the 5mm thickness would require some formal specification from your client because the 5mm thickness is outside the range allowed by ISO 13588, so you cannot strictly comply with the Code you quoted.
To request an official interpretation to this ISO Standard you are instructed to have your national standards body contact the Secretariat of ISO/TC 44/SC 5

 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 423

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
423
21:14 Nov-02-2018
Re: PAUT on 5 mm thickness P265GH
In Reply to Govindraj at 09:16 Nov-02-2018 (Opening).

Govindraj,
this can be of interest on the NDT.net database: "Inspection of Welds in Thin Structures", J. Rudlin, C. Carpentier5, S. Majidnia -TWI Ltd.
Search the database for more.
During the exam you can not stay too far from the geometrical configuration experimented.
greetings
mario

 
 Reply 
 

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