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Technical Discussions
Ant Purdy
Ant Purdy
08:24 Aug-08-2013
roots with backing strips

UT - Manual

when doing a root examination when a welded backing bar/strip is used what are we looking for in terms of defects? should it be fully fused? partially? is there a EN/ISO for this?

please advise?

    
 
 Reply 
 
Diego Martínez del Valle
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego Martínez del Valle

Consultant,
Freelance,
Spain,
Joined May 2013
188
19:32 Aug-08-2013
Re: roots with backing strips
In Reply to Ant Purdy at 08:24 Aug-08-2013 (Opening).

Hi Ant Purdy
I think that there is not any EN / ISO standard about welded joint type.
Perhaps you could find some help in the standards EN ISO 5817 and 6520. If the welded joints are in a European pressure vessel, the EN 13445 could be applicable
In may opinion examining the root should be treated as if it were a full penetration weld without backing bar / strip.

    
 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 411

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
411
04:10 Aug-09-2013
Re: roots with backing strips
In Reply to Diego Martínez del Valle at 19:32 Aug-08-2013 .

Diego,
I agree. This joint is a variant of butt weld and should be treated according to the regulatory environment in which it operates.
Very little help for UT examination with EN ISO 5817 and 6520 !
Greetings.
Mario

    
 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
18:27 Aug-10-2013
Re: roots with backing strips
In Reply to Ant Purdy at 08:24 Aug-08-2013 (Opening).

The backing bar is an aid for the welder only. Lack of fusion to the backing bar, is not relevant to the strength of the weld.
All the best

    
 
 Reply 
 
ismail
NDT Inspector, TOFD and PAUT Specialist
Turkey, Joined Oct 2008, 24

ismail

NDT Inspector, TOFD and PAUT Specialist
Turkey,
Joined Oct 2008
24
10:18 Aug-11-2013
Re: roots with backing strips
In Reply to andrew cunningham at 18:27 Aug-10-2013 .

Dear Andrew

Thanks for your explanation.I think about backing strips same to you.

İsmail

    
 
 Reply 
 
Mario Talarico
NDT Inspector,
Italy, Joined May 2010, 411

Mario Talarico

NDT Inspector,
Italy,
Joined May 2010
411
15:02 Aug-11-2013
Re: roots with backing strips
In Reply to andrew cunningham at 18:27 Aug-10-2013 .

Andrew,
I practiced this joint mostly in construction (funds tank, side by side plates on beams, casing, etc..), then non-removable backing.
Reading your syntesys makes me think that indeed, once ensured root penetration, I have never been concerned with the lack of fusion de backing, nor have I ever been in any specific place this requirement.
Should be noted however, according to good practices, if this requirement were to be placed, then the flat grinding of external cap to scan by zero degrees would be a requirement.
greetings
Mario

    
 
 Reply 
 
andrew cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

andrew cunningham

NDT Inspector
Canada,
Joined Jun 2008
238
23:25 Aug-11-2013
Re: roots with backing strips
In Reply to Mario Talarico at 15:02 Aug-11-2013 .

I have found it easier, to scan from the inside and going through the backing strip.

all the best

    
 
 Reply 
 

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