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Technical Discussions
Uday Kale
Director, NDE Services, Inservice Inspection, ASME Code shop Level III Services, Training in NDE and API
KUB Quality Services Pvt. Ltd, India, Joined Apr 2000, 8

Uday Kale

Director, NDE Services, Inservice Inspection, ASME Code shop Level III Services, Training in NDE and API
KUB Quality Services Pvt. Ltd,
India,
Joined Apr 2000
8
03:59 Jan-16-2001
Demagnetization requirement for AC yoke

Dear All,
Can somebody tell me that whether Demagnetization is required
when material is magnetized using AC current Yoke.
Material is D2 and Component is a Die Block and Inspection
is done after service.
It will be very nice if you can give me the reference for
the same,
Thanking you,

Uday Kale


 
 Reply 
 
Nick Welland
Nick Welland
09:49 Jan-16-2001
Re: Demagnetization requirement for AC yoke
: Dear All,
: Can somebody tell me that whether Demagnetization is required
: when material is magnetized using AC current Yoke.
: Material is D2 and Component is a Die Block and Inspection
: is done after service.
: It will be very nice if you can give me the reference for
: the same,
: Thanking you,

: Uday Kale

Yes, it is quite likely that an AC yoke will leave a residual field in a component, especially in a tool or die steel.
Fortunately the same yoke can usually demagnetize the workpiece by pulling it off the surface while still energized and withdrawing it to a fair distance before switching off. Always check with a field indicator before and after.
Most Standards have a requirement to demag if a residual field is detrimental to service or a subsequent manufacturing operation.
Regards
Nick


 
 Reply 
 

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