Pages

Sep 8, 2012

Surface Eddy Current Testing

Surface Eddy Current Testing is used for the detection of surface cracks in both nonferromagnetic and ferromagnetic materials. The method is very sensitive in detecting tight cracks. Calibration is performed on electrical discharge machined notches. In addition to detection, the method can accurately measure crack depth in nonferromagnetic materials. These materials include stainless steels and high temperature nickel chromium alloys. When sizing cracks, the eddy current test frequency is selected so that the depth of penetration is greater than the expected crack depth. Some common probes used for surface eddy current testing are spot probes, X-point probes and pencil probes.
Both surface eddy current testing and liquid penetrant testing are surface test techniques used for the detection of surface breaking cracks. Eddy current testing has advantages over liquid penetrant testing in certain applications:
  • eddy current testing is significantly more sensitive than liquid penetrant testing in the detection of tight cracks (for example, stress corrosion cracks in stainless steels)
  • eddy current testing can measure crack depth in nonferromagnetic materials, whereas liquid penetrant testing does not have this capability
  • eddy current testing can test through paint coatings
  • for testing in small areas, eddy current testing is much faster; liquid penetrant testing is slow because of the long dwell times.
From:(http://www.asnt.org/publications/materialseval/basics/nov03basics/nov03basics.htm)


Labels: , , , ,

11 comments:

  1. AnonymousSeptember 8, 2012 at 11:24 AM

    Yes it is common

    ReplyDelete
  2. ZulDecember 17, 2012 at 2:54 PM

    Interesting article, good introduction to eddy current for those not in the know.

    - Zul TesTex NDT

    ReplyDelete
  3. AnonymousApril 14, 2013 at 6:29 AM

    Loren Cordain's paleo diet is based on low-fat dairy products, salt, and cinnamon. Off-limits are grain foods such as fruits and vegetables.

    my homepage; paleo book

    ReplyDelete
  4. AnonymousMay 8, 2013 at 3:51 PM

    You'll be able to go into any room, garage or even your yard and setup a work out location.

    Here is my web page - Share Group

    ReplyDelete
  5. AnonymousMay 9, 2013 at 10:25 PM

    Rearrange the following words to create the most effective way of writing best Web
    Search Engine copywriting. The website owner should try and remove
    the links manually in the first couple pages, it's a bad idea to make headers all about keywords.

    Here is my web-site seo rank

    ReplyDelete
  6. AnonymousMay 10, 2013 at 1:01 AM

    The facility Rod Resistance can go from as minimal as five kilos to as
    much as 210 lbs ., which means that it is ideal for novices and specialists alike.


    My web-site: dumbbell sets

    ReplyDelete
  7. AnonymousMay 13, 2013 at 5:53 AM

    To thwart this, you will never hear from them, for like you, they can get ahead of their competition automatically since searchers will see their site first.
    The road to page one ranking in search engines.


    Here is my blog post: search engine marketing

    ReplyDelete
  8. AnonymousMay 16, 2013 at 7:17 AM

    The a few most critical parts to get lean muscle mass dimensions are as follows.


    Here is my page - dumbbell sets

    ReplyDelete
  9. AnonymousJune 6, 2013 at 1:39 AM

    Not surprisingly, the most effective part about their handle panels could be the point which they are truly
    quick to browse and program.

    Here is my blog post ... what are the best adjustable dumbbells

    ReplyDelete
  10. AnonymousJune 8, 2013 at 2:10 AM

    The genuine mystery into the overall system
    of anti-aging could well be to take care of your procedure
    appropriately and possess entertaining within the approach.



    Here is my website - adjustable weights

    ReplyDelete
  11. Paper testingSeptember 8, 2014 at 4:03 PM

    Surface Coating Instruments manufacture in india

    ReplyDelete

Subscribe to: Post Comments (Atom)