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Technical Discussions
Darlene Johnston
Darlene Johnston
03:59 Apr-30-2004
Portable Yoke - field depth

I work in a small NDT shop and the Chief Inspector was speaking with us about the use of a Portable Yoke. The following question came up - Using a portable yoke, what would be considered a)the depth into the material reached by the field, and b) the width of the field extending out from the legs of the yoke? (ie. 4 inch down/depth and 5 inches to out from the yoke legs?)

Reference is made to the use of Portable Yokes in the standards but we haven't come across any information about the fields.


 
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William Blum
Consultant, Training, Level III Services
NDT Consulting Group Inc., USA, Joined Nov 2000, 92

William Blum

Consultant, Training, Level III Services
NDT Consulting Group Inc.,
USA,
Joined Nov 2000
92
05:29 May-01-2004
Re: Portable Yoke - field depth
AC yokes are limited to surface indications only. DC yokes can go deeper but whether or not the indication will be visible would depend upon several factors including the type of particles used. You are certainly not likely to see anything 4 inches deep. Many procedures limit the inspection area outside of the legs to 1/4 of the leg spacing.

To learn more about MT, see www.ndt-ed.org. Specifications include ASTM E709 and E1444.

----------- Start Original Message -----------
: I work in a small NDT shop and the Chief Inspector was speaking with us about the use of a Portable Yoke. The following question came up - Using a portable yoke, what would be considered a)the depth into the material reached by the field, and b) the width of the field extending out from the legs of the yoke? (ie. 4 inch down/depth and 5 inches to out from the yoke legs?)
: Reference is made to the use of Portable Yokes in the standards but we haven't come across any information about the fields.
------------ End Original Message ------------




 
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