複合溶鍛品の超音波探傷

概要

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The special composite squeeze castings, being develped under Daidos research, for punching dies and cutters are those things having chiefly tool steel of mother material on which a tungsten carbide hardened layer of from 1 to 5mm is squeeze cast on its one side.The harmful flaws are inclined to grow in the said layer and the boundry layer between mother material and the former layer.The thickness of hardened layer is necessary to be cast as thick as appointed thickness.And these are important tasks to detect flaws and to measure the thickness of the hardened layer under non-destructive method.For these, it is now possible to detect flaws in the layer and in the boundry layer by ultrasonic wave double crystal probe method. Furthermore, a new technique which enables us to detect the thickness of the hardened layer was invented using the same method.After repetition of various checking experiments of detecting flaws and thickness we were able to confirm that the practical use is high enough with precise flaws detecting conditions and therefore, the report is described hereunder.
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