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NDT.net Issue - 2010-06 - NEWS

Magnetic Analysis Corporation Test Technology For Wire & Bar


Magnetic Analysis Corp (MAC)25, Elmsford, NY, USA
 
NDT.net Journal
Issue: 2010-06
The detection of the few flaws that may occur in large production runs of metal wire or bars at production line speeds is best accomplished using the NDT techniques that are most capable of detecting the specific unacceptable conditions that are anticipated in the product.

For critical applications where the wire or bar must be free of surface, subsurface and internal defects of a variety of shapes and sizes, systems with multiple test stations at which dedicated techniques, based upon ultrasonic and eddy current methods, are often used. An example of this is shown in the accompanying picture of an automated test system for cold drawn bar. Included are an encircling differential coil eddy current tester for detecting short surface and subsurface defects such as slivers and pits; a spinning probe eddy current system to find long, surface defects such as seams; and a rotating transducer ultrasonic system for internal defects such as non metallic inclusions or stringers. Also included is an absolute coil eddy current system for detecting grade or alloy mix and a demagnetizer to minimize residual magnetism generated by the eddy current system when inspecting magnetic material.

These components are mounted on a constant center test bench with triple roll drives which are adjusted and controlled automatically through Conductor controls. This type of bench is especially useful for small diameter coil to bar installations, as small as 12 mm, where centering is critical.

By using multiple test methods, less false rejects will occur and fewer unacceptable defects will be missed than in a system using only one test method. The value of the investment is quickly returned through higher yields and fewer product claims.

Magnetic Analysis Corp (MAC)

More of Magnetic Analysis Corp (MAC) published in NDT.net
2019-07-01: Obituary: Magnetic Analysis Corp’s Long-Time President and Chairman William Gould
2019-06-01: The Origins of Practical Electromagnetic Testing and The Historical Contributions of Magnetic Analysis Corporation to Non-Destructive Testing
2019-03-01: Magnetic Analysis Corp. Introduces 25mm Ultrasonic Rotary to Test Small Diameter Bar
2018-10-01: MAC’s Echomac® FD-6A and TACTIC UT Immersion System for Critical Applications
2018-10-01: Mac’s New Rotoflux® AC Flux Leakage Tester For Testing Hot Rolled Bar
2018-07-01: The Test of Time: Magnetic Analysis Corp. Celebrates 90 Years
2018-04-01: Testing High Performance Small Diameter Nitinol Wire
2018-03-01: MAC System Tests for Eccentricity in Copper Tube
2018-03-01: MAC has supplied an Ultrasonic/Eddy Current System for Automotive Shock Absorber Tubing
2018-03-01: Velocity Measurement for Determining Ductility and Nodularity in Cast Iron
All 25 Articles & News of Magnetic Analysis Corp (MAC) in NDT.net

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