01:12 Mar-22-2001 Re: Testing Hot Metals : I have just read the message that I posted earlier and have detected a typing error. . : The flaws are 20mm (not 200mm) below the surface. . : Please accept my apologies. . : Steve Prince . It exist quartz temperature intreface. The system could be refresh. And the length of the interface depend on the température difference needed and the ultrasonic wave length.
This is a contact technology. Perhaps you absolutly need a non contact technology?
01:40 Mar-23-2001 Re: Testing Hot Metals EMAT have been used in these temperature ranges successfully. Problem is always one of sensitivity. At these defect sizes that should not be a problem if you want to simply detect them. If you want to size growth of the defects over a period of time that may be a problem.
IHI Southwest have been doing some work in the Hydrocarbon process industry with a portable EMAT device you could try them.
There are also a number of EMAT specialist companies in Germany, and Canada.
: Lixi's Profiler with graphite heat shield will find : 20mm voids in 120mm thick steel plates. . Sonovation have developed a method to inspect thick welds at temperatures of over 400 degrees Celcius. We have validated the method for test pieces of 240/180 mm of steel, whereby we could find an EDM notch of 3 mm deep at 500 degrees C. For smaller defects we can reliably do the inspection at some 430 degrees C. We have applied the method in practice for initial and repeat inspections now. Safety was an important issue here and we have set up a separate procedure for working under these conditions, which should not be underestimated.