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Technical Discussions
karolina krajèek
karolina krajèek
08:58 Jun-11-2003
magnetic testing

I found in A319/A320 maintenance manual (aircraft) something about MT on a MLG axle and it says HWDC 4 turn coil .Iwould like to know what is that HW ,DC is probably direct current?


 
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Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
05:05 Jun-11-2003
Re: magnetic testing
HWDC is an MPI bench unit machine setting giving a rectified AC output. This gives a compromise inspection solution between AC which due to the skin effect is very effective at surface flaw detection but with very little sub-surface flaw detection capability and DC where relatively deep-lying defects may be detected though with a concomitant sensitivity loss for surface flaws.

You'll need a pretty hefty 4 turn coil and high output bench unit for an A319/A320 main landing gear axle. Plus I should imagine there will be a requirement for inspection shot for longitudinally oriented flaws as the coil shot will only find circumferential oriented flaws (more specifically flaws oriented parallel to the coil turn direction). If you are not familiar with all of this then may I suggest you sub-contract it to someone who has the right equipment, knowledge, qualifications and experience.

Hope this is helpful

Best regards

Nigel





 
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DJ Kallhof
DJ Kallhof
06:52 Jun-11-2003
Re: magnetic testing
: I found in A319/A320 maintenance manual (aircraft) something about MT on a MLG axle and it says HWDC 4 turn coil .Iwould like to know what is that HW ,DC is probably direct current?
HWDC has the penetrating power of single phase full wave DC and the skin effect of AC. The pulse of the rectified wave produces maximum particle mobility with dry particles. The down side is demagnetizing can be difficult.



 
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