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Posted: 9/23/2006 7:59:14 PM EDT
| What exactly is magnetic particle testing? What defects are being looked for? How often is something found? Do all manufacturers use this test or only those with government contracts? |
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Magnetic particle testing is a non-destructive testing method for detection of imperfections on or just below the surface of ferrous metals. It is a quick and reliable technique for detection and location of eg. surface cracks. A magnetic flux is send through the material. At the location of the imperfection a leakage field is formed. This attracts metal iron dust, which is sprayed onto the surface. The length of the imperfection can be determined very reliable. Magnetic particle testing does not indicate the depth of the imperfection. Acceptance criteria define whether or not the indication is non-acceptable (a defect) or not. Magnetic particle testing can be used for all ferrous metals, such as carbon steel, low-alloy and cast iron. The main use of Magnetic particle testing is for welds and heat affected zones. It can be applied to relatively rough and dirty surfaces but flaw sensitivity is decreased for this. Fluorescent particles can be used when maximum sensitivity is required. |
It was a lot of fun.
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For the absolute anwers IRT, I have the Mil-Std docs from the .gov on Magnetic Particle Testing, the Proof Load (high pressure), and the one on Chrome Lining barrels and the chamber. It is some serious multi-page techno garble, but informative, and would probably be good to add to the documents section here. I'll start working on the Site Staff, to get them added, so the MP/C questions that come daily can be referred to the Doc' section from now on..... |
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