Non Destructive Testing To assure the integrity of critical parts where flaws cannot be detected by conventional inspection techniques, MIC uses Non-Destructive Testing during in process and final inspection to evaluate individual parts, welds, or complete assemblies. NDT Methods include: Dye Penetrat per MIL-STD-6866B Pressure Testing to 20,000 PSI (Also Hydroforming) Ultrasonic Verification Hardness Testing Helium Leak Testing Electrical Testing

Helium Leak Testing

MIC Group has the ability to use a helium leak detector to inspect the integrity of welded, brazed and soldered joints, sealed assemblies, and glass-to-metal seals. Helium leak testing is superior to common air and bubble testing. The most common method of helium leak testing involves evacuating the interior of the test piece, and discretely spraying helium on the possible leak site(s). Any leaks are evident when the helium flows through the evacuated test piece and is detected by the mass spectrometer in the helium leak
detector.

Leak rates for helium are measured by the number of "std. cc/sec" escaping at the leak location (i.e. 3 x 10-8 Std. cc/sec). Breathing on a 10-6 Std. cc/sec leak provides enough moisture to close it temporarily, perhaps for several days. MIC Group has the capability to measure leak rates as small as the 10-9 std. cc/sec. We are experienced in the special fixturing, cleaning and handling requirements for accurate helium leak testing.
Referenced leak rates for helium versus other leak
tests are: