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- since 1996 -
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Technical Discussions
GOWRISANTHOSH
NDT Inspector,
Royscan engineering pte ltd, Singapore, Joined May 2008, 52

GOWRISANTHOSH

NDT Inspector,
Royscan engineering pte ltd,
Singapore,
Joined May 2008
52
07:38 Aug-07-2011
MT indication
zoom image

MT indication

hi
please comment and suggest on attached image. i got this indication while was doing MT at toe of the weld on both side.
thank you

regards
Gowrisanthosh

 
 Reply 
 
Ryan Burns
Ryan Burns
02:53 Aug-08-2011
Re: MT indication
In Reply to GOWRISANTHOSH at 07:38 Aug-07-2011 (Opening).

Hi Go,

To me it looks like cold lap / lack of fusion. I have seen a bit of this with SAW welds. I'd guess too fast a travel speed and / or not enough current. In one case we were asked to excavate with a carbide bit, and the non fusion was evident to the vessels' corrosion allowance of 1/16". I'd rule out toe cracks as the indication follows the bead edge too closely and uniformly.

Regards,

Ryan.

 
 Reply 
 
Godfrey Hands
Consultant,
PRI Nadcap, United Kingdom, Joined Nov 1998, 306

Godfrey Hands

Consultant,
PRI Nadcap,
United Kingdom,
Joined Nov 1998
306
08:07 Aug-08-2011
Re: MT indication
In Reply to GOWRISANTHOSH at 07:38 Aug-07-2011 (Opening).

Hi,
First thing I would do here is to see if a magnet is attracted to the parent material and also to the weld.
It could be that one of them is not able to be magnetised.

Godfrey

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
11:09 Aug-08-2011
Re: MT indication
In Reply to Godfrey Hands at 08:07 Aug-08-2011 .

Even if both weld material and base metal are magnetic, there may be a large enough difference in permeability to create the indication shown. In this case I suggest that you grind the surface flat for about 10 cm length of indication without too much pressure (to avoid "smearing" the indication closed) and do a good visual check followed by PT

 
 Reply 
 

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