8/16/2023 0 Comments Best iron casting foundry![]() In addition, couplant selection, surface condition, casting geometry, gauge calibration, and scatter noise can affect the accurate measurement of castings.Ĭouplant: The rough surfaces typically found on sand castings will impair transducer coupling, so a high-viscosity couplant such as gel (Couplant D) or glycerin (Couplant B) should always be used. Ultrasonic Gauging Procedure to Measure Wall Thickness of Castingsĭetailed gauge setup and calibration procedures can be found in the operating manual for each instrument. The 72DL PLUS gauge can also be integrated into systems designed to monitor the sound velocity of castings. This high-speed thickness gauge offers measurement speeds up to 2 kHz along with a velocity mode and through-transmission capability. For castings thicker than approximately 50 mm (2 in.), a large diameter, low-frequency transducer, such as the 500 kHz M101, is often recommended.Īnother option for wall thickness tests of castings is the 72DL PLUS™ gauge. Commonly used transducers are the M106, M1036 (both 2.25 MHz), M109, and M110 (both 5 MHz). Transducer selection depends on the range of thickness to be measured and the acoustic properties of the specific cast metal. If metal thickness exceeds approximately 12.7 mm (0.5 in.), High Penetration software should be used. Wall thickness tests of castings can be performed with the 38DL PLUS™ or 45MG thickness gauge with Single Element software. Ultrasonic techniques offer a nondestructive alternative to microscopic cross-sectional examination and tensile strength tests for determining the degree of nodularity, because nodularity can be correlated to sound velocity. Testing for nodularity is especially important in the automotive industry and other fields where the safe operation of cast iron components is a major concern. The size and distribution of graphite inclusions (nodularity) have a major impact on the mechanical strength of cast iron. These conditions produce ultrasonic indications that can be identified by a trained operator using an ultrasonic flaw detector with appropriate transducers. Voids, porosity, inclusions, and cracks in the metal can occur during the casting process. An ultrasonic thickness gauge can measure wall thickness from one side, with no need to cut the part for access. Core shifts during the casting process can result in a part that is too thin on one side and too thick on the other. ![]() Ultrasonic thickness gauging is commonly used to measure hollow castings with complex shapes, such as automobile engine blocks. Velocitybased ultrasonic testing using either thickness gauges or flaw detectors can also be used to quantify graphite nodularity in cast iron. Ultrasonic flaw detectors can also be used to identify discontinuities like hidden porosity, inclusions, voids, and cracks. Ultrasonic thickness gauges can be used to measure the wall dimensions of hollow castings. Today, microprocessor-based instruments using ultrasonic sound waves can accurately provide much more information about the hidden internal structure of both ferrous and nonferrous castings. In the past, a foundry worker would estimate the quality of a casting by tapping it with a hammer to evaluate the sound of the ring. The art of casting metal into specific shapes has been practiced for thousands of years but only in recent decades have modern ultrasonic NDT tools been available to help ensure product integrity. This application note provides a general overview of ultrasonic nondestructive testing applications in the foundry industry, including thickness gauging, flaw detection, and nodularity testing. Consultation Reception about Introduction.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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