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Technical Discussions
Russ
USA, Joined Jan 2016, 2

Russ

USA,
Joined Jan 2016
2
18:27 Jan-30-2016
ASME MT/PT WELD INSPECTION ZONE

Can anyone identify the para in ASME VIII that defines the inspection area for MT and PT weld inspection. I am looking for any words in the Code to inspect the HAZ, and how much of the HAZ. There are words to clean 1" adjacent to the weld, but nothing that specifically says to also inspect 1".

 
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barry mc donald
United Kingdom, Joined Sep 2015, 14

barry mc donald

United Kingdom,
Joined Sep 2015
14
21:30 Jan-30-2016
Re: ASME MT/PT WELD INSPECTION ZONE
In Reply to Russ at 18:27 Jan-30-2016 (Opening).

hi here in the uk it is 25mm , 1" either side of weld hope that helps bud

 
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Dent
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 252

Dent

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
252
22:09 Jan-31-2016
Re: ASME MT/PT WELD INSPECTION ZONE
In Reply to Russ at 18:27 Jan-30-2016 (Opening).

It may not be spelled out in ASME Section VIII ( I only checked in Div. 1) but ASME Section III clearly states 1/2" on each side of the weld in NB 5140.

 
 Reply 
 
Russ
USA, Joined Jan 2016, 2

Russ

USA,
Joined Jan 2016
2
17:30 Feb-02-2016
Re: ASME MT/PT WELD INSPECTION ZONE
In Reply to Dent at 22:09 Jan-31-2016 .

Thanks for the feedback. So if no one is aware of specific words in Section VIII, maybe there is no defined requirement. I think most would agree it is prudent to look for HAZ cracks. Is there a consensus that 1/2" is appropriate for a procedure requirement since it matches Section III? The other option would be 1" since Section V says to clean 1" adjacent to the weld.

 
 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
18:54 Feb-02-2016
Re: ASME MT/PT WELD INSPECTION ZONE
In Reply to Russ at 17:30 Feb-02-2016 .

Russ, I too could find no reference to the "extra" HAZ coverage required for the surface methods in accordance with ASME VIII. However, the instructions in ASME VIII Div. 2 (2007) in 7.5.5 where UT is used in lieu of RT, might be a helpful guide. There we read that the examination area shall include the volume of the weld, plus 50mm (2in) on each side of the weld for material thickness greater than 200mm. For material less than 200mm, the area is to include the weld volume plus the lesser of 25mm or 't' on each side. Alternatively the examination volume may be reduced to include the weld volume plus the actual HAZ plus 6mm of base material beyond the HAZ on each side of the weld. But this requires that the actual extent of the HAZ be measured (perhaps by etching??).

 
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