![]() The waveforms below show a typical response from a 2 mm (0.080 in.) Babbitt liner inside a 17.75 mm (0.700 in.) steel shell, using a V112-RM contact transducer. If the liner is disbonded, there will be only a large echo from the inner surface of the shell. If the liner is bonded, a small echo from the shell/liner boundary will be followed by a larger echo from the liner ID. Common choices include the V112-RM (10 MHz), V110-RM (5 MHz), and V106-RM (2.25 MHz) transducers. In cases where the outer surface of the bearing shell is accessible and concentric with the inside diameter (ID), the simplest procedure is to test from the outside with a small contact transducer, typically in the frequency range from 10 MHz to 2.25 MHz. (a) Bond test from the outer surface of a bearing These include the EPOCH ® 6LT, and EPOCH 650 instruments. Selected contact or delay line transducers can be used as described below. Babbitt bonding and thickness can be readily tested with ultrasonic flaw detectors if the Babbitt layer thickness is greater than approximately 0.2 mm (0.008 in.).Īny Olympus flaw detector can be used for this test. Proper bonding between the Babbitt liner and the steel or bronze shell is essential for performance, and the thickness of the Babbitt is often of interest as well. Babbitt bearings typically consist of a relatively thin layer of Babbitt cast over a steel or bronze shell that provides structural strength. Testing the bond between Babbitt metal bearing liners and steel or bronze bearing shells and measuring the liner thickness.īabbitt metal, first formulated in 1839, is an alloy of tin or lead, copper, and antimony that is commonly used as a rolling contact surface in friction bearings because of its low coefficient of friction, good load-bearing and lubrication properties, and resistance to galling. OEM Microscope Components for Integration.Semiconductor & Flat Panel Display Inspection Microscopes ▾.Aerospace/Wind Blade Inspection Scanners.Flaw Detectors / Phased Array Flaw Detectors ▾.Thickness and Flaw Inspection Solutions ▾. ![]()
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