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Technical Discussions
Huzairi
Malaysia, Joined Apr 2015, 18

Huzairi

Malaysia,
Joined Apr 2015
18
11:57 Apr-03-2018
Surface indication after MPI
zoom image



Dear All,

Refer to image.Few LW joint show this indication after MPI.Very clear line of indication at weld toe.But what make me confuse is after perform RT and UT , no indication or defect was detected.After do grinding and re-mpi, the indicatiom still occur.Expected this is cold lap.Material is carbon steel,double V welding and SAW welding process.Hope some kniw about this can explain to me.Very appreciated for the help.Thanks.

 
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ezio
Other, Retired ex Laboratory Technical Manager
OMECO Research Centre, Italy, Joined Sep 2008, 278

ezio

Other, Retired ex Laboratory Technical Manager
OMECO Research Centre,
Italy,
Joined Sep 2008
278
14:44 Apr-03-2018
Re: Surface indication after MPI
In Reply to Huzairi at 11:57 Apr-03-2018 (Opening).

Hello Huzairi, differenza di permeabilità magnetica tra materiale base e materiale di apporto?

 
 Reply 
 
P V SASTRY
R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D, India, Joined Jan 2003, 195

P V SASTRY

R & D, NDT tecniques metallurgy
TAKEN VRS FROM THE POSITION OF SR. DEPUTY GENERAL MANAGER BHEL CORPORATE R&D,
India,
Joined Jan 2003
195
14:46 Apr-03-2018
Re: Surface indication after MPI
In Reply to Huzairi at 11:57 Apr-03-2018 (Opening).


These indications are most probably due to permeability changes between the weld and parent metal.

Whenever such indications are encountered first PT has to be done (later may be RT and UT).

Please do PT and if there are no significant indications you can clear the joint.

However the indications are much sharper than normal. Hope you are going to give a proper thermal treatment like SR.

Best Wishes

P V SASTRY

 
 Reply 
 

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