Detecting Ferrous Inclusions in Nonferrous Tube

Detecting Ferrous Inclusions in Nonferrous Tube Ferrous inclusions in nonferrous tube. To detect ferrous inclusions such as metal filings from finning tools that are introduced into a tubular product during processing, the Magnetic Analysis Corporation MID flux leakage instrumentation is particularly effective. A stable DC magnetic field is established using a permanent magnet or saturation coil platform. The test coil detects changes in the flux field caused by the ferrous inclusion. An MID flux leakage card can be incorporated in MultiMac eddy current instrumentation. Finned Tube Without Transitional ( land) Zones Experience in testing titanium tubes without transitional land zones shows that inclusions as small as .00035 grams can be detected at production line speeds in excess or 300 feet per minute. Finned Tube with Transitional ( land) Zones For finned copper tubing with transitional “ land” zones, ( the area on the tube where there are no fins to allow the tube to rest on tube supports when installed in a heat exchanger or similar application) the signal for the inclusion is usually greater than the signals from the beginning and end of the transitional land zones, thereby permitting detection of the inclusion. However, as the throughput speed of the test increases, the signals from the transitional land zones increase at a faster rate than the signals generated by ferrous inclusions, making it difficult to detect the inclusion. Experience in mill applications has shown that keeping the maximum throughput speed in the range of 250 to 300 fpm allows the inclusions to be detected. Above these speeds, detection is not reliable. Calibration Standards Ferrous filings are so small, it is difficult to create a calibration standard. This problem can be solved by embedding a sample of the ferrous filings you wish to detect in a small amount of paraffin wax, then inserting this into a hollowed out cork. Distributor agent menjual service repair jasa perancangan perbaikan dan upgrade alat, sensor dan sistem Inspeksi eddy current test system, ultrasonic tester, flux leakage inspection system, Multiple & Custom NDT Systems: inspeksi quality check keretakan automotive parts for cracks, alloy, and heat treatment, bearing races for cracks, aluminum sheet for inclusions, US Army ordnance parts for cracks, rail testers ( M A Nordic) , dll. Jakarta - Indonesia Phone : 021-29563045 ( hunting) Hp : 08156141954 Pin BB : 284152F7