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Cracks of 1 micron in width

 
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Quintin



Joined: 03 Oct 2006
Posts: 1
PostPosted: Tue Oct 03, 2006 9:27 am    Post subject: Cracks of 1 micron in width Reply with quote
Hello,

I am new to NDT and have a project that calls for it. I need to detect cracks, as small as 1 micron in width, in the weld of a steel pipe. Has anyone out there had to detect cracks this small or does anyone know which method of testing would be the best?

thanks,
Quintin
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cryogenicshaun



Joined: 07 Jun 2006
Posts: 22
Location: Baytown, Tx.
PostPosted: Fri Oct 06, 2006 9:36 am    Post subject: Reply with quote
What is the size of the specimen that you are welding? Thickness? Material? Are you looking for something surface or subsurface?
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Shaun Hollaway, Sr.
Conam Inspection
hollaways1217@verizon.net
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p.vipe



Joined: 13 Jan 2008
Posts: 3
Location: Houston, TX
PostPosted: Wed Jun 18, 2008 4:32 pm    Post subject: Reply with quote
I am guessing you are doing penetrant testing. Surface methods are the ones that require defect opening sizes to prove detectability from your procedure.
You will need to purchase a set of chrome crack panels with the 1 micron width and 20 micron depth. Your penetrant should be a type 1 (fluorescent) and sensitivity level 3. Since you are testing welds a method A (water washable) would work best on welds that are not ground smooth. If they are ground smooth than a method C (solvent removable) would give you a little more sensitivity. Your dwell time can be set by experimenting with the panels. Try starting with 25 minutes.
Hope this helps you.
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