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Case Study: Extrusion Weld Detection in Aluminum Rod

From Resonic NDT Systems
 

 

Extrusion weld detection: A .565 in. I.D. N:5 Resonance mode transducer was utilized to generate a subsurface ultrasonic resonance in a .440 in. OD aluminum rod. The frequency response is plotted against the lineal distance logged by a rotary encoder connected to the ARIS unit. The acoustic energy is concentrated at about .11 in. from the centerline of the rod. The press start/stop region and the pointed region of the weld are detected. The interior of the "bullet" indicates a differing precipitation state and this does return to the resonant frequency "normal internal resonance" of the exiting billet within a foot or so.

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Topics of Interest
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