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629 views
05:06 Apr-22-2005

Fred Raco, Jr.

Consultant, Partner in NDT Laboratory
RNDT, Inc.,
USA,
Joined Jul 2002
24
super austenitic plate material

Can anyone assist us on a way of measuring the residual magnetism (if any) on a super austenitic plate material after welding?


 
01:26 Apr-22-2005
DJ Kallhof
Re: super austenitic plate material Austenitic stainless steels unlike Martensitic don't typically have residual magnetism problems. To verify this I would suggest using a Hall Effect Probe. Just out of curiousity, what is the AMS number of the material you are dealing with?
----------- Start Original Message -----------
: Can anyone assist us on a way of measuring the residual magnetism (if any) on a super austenitic plate material after welding?
------------ End Original Message ------------




 
02:54 Apr-28-2005
Jim Knowles
Re: super austenitic plate material Austenitics do suffer from a magnetic effect especially after a weld repair, its called retained Delta ferrite.
Too higher delta ferrite can impair the corrosion properties of the stainless material. The delta ferrite levels usually found after welding to an approved weld procedure can be between 3-6% Fe, on repairs to a repair or un authorised re running of weld cap profiles levels of Fe can rise to around 10-12%.
Equipmemt used to measure accurately is the Forster Mangnetoscop 1.068 model.


----- Start Original Message -----------
: Austenitic stainless steels unlike Martensitic don't typically have residual magnetism problems. To verify this I would suggest using a Hall Effect Probe. Just out of curiousity, what is the AMS number of the material you are dealing with?
: : Can anyone assist us on a way of measuring the residual magnetism (if any) on a super austenitic plate material after welding?
------------ End Original Message ------------




 


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