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- since 1996 -

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Technical Discussions
a.chagas
Other, QC SUPERVISOR
GE - Setubal, Portugal, Joined Oct 1999, 1

a.chagas

Other, QC SUPERVISOR
GE - Setubal,
Portugal,
Joined Oct 1999
1
01:18 Jul-09-1999
A problem with Magnetic Testing

Hi,
On welding of tube, 5ox5mm with two differents materials (SA213T91 and SA213T22)we have a linear indication (longitudinal),from Magnetic Testing.
Can you give us an explanation, about the origin of this problem?
Best regards, waiting for solution to this problem.


    
 
 
Michael Trinidad
Consultant,
LMATS Pty Ltd , Australia, Joined Jan 2003, 138

Michael Trinidad

Consultant,
LMATS Pty Ltd ,
Australia,
Joined Jan 2003
138
09:41 Jul-09-1999
Re: A problem with Magnetic Testing
Hi,
On welding of tube, 5ox5mm with two different materials (SA213T91 and SA213T22)we have a linear indication (longitudinal),from Magnetic Testing.
Can you give us an explanation, about the origin of this problem?
Best regards, waiting for solution to this problem.


This can be quite a common problem if there is a significant permeability difference between the two steels. What you are most likely seeing is the flux leakage occurring at the permeability change

Michael Trinidad
ETRS NDT Project Supervisor
KBJV Worsley Expansion Project
Direct Tel: 61-8-9781-6232
Fax: 61-8-9781-6233
Email: etrs@kbjv.com




    
 
 
David Hermanutz
Consultant,
Hbndt.com, China, Joined Jul 2012, 85

David Hermanutz

Consultant,
Hbndt.com,
China,
Joined Jul 2012
85
04:13 Jul-11-1999
Re: A problem with Magnetic Testing
: Hi,
: On welding of tube, 5ox5mm with two different materials (SA213T91 and SA213T22)we have a linear indication (longitudinal),from Magnetic Testing.
: Can you give us an explanation, about the origin of this problem?
: Best regards, waiting for solution to this problem.

:
: This can be quite a common problem if there is a significant permeability difference between the two steels. What you are most likely seeing is the flux leakage occurring at the permeability change

: Michael Trinidad
: ETRS NDT Project Supervisor
: KBJV Worsley Expansion Project
: Direct Tel: 61-8-9781-6232
: Fax: 61-8-9781-6233
: Email: etrs@kbjv.com

It is best to follow up such indications with a dye penetrant procedure to determine the absence of a weld defect.
Or switch to a non magnetic surface test procedure.
In one instance I came across a faulty weld procedure after doing a PMI out of curiosity of such an indication.
148 cut outs and 26 pups later the problem was corrected... (six day overrun on a shutdown due to one typo)

David Hermanutz
Pilbara NDT
Melbourne, Australia





    
 
 

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