Abstract
A 50 kc/sec ultrasonic flaw detector was applied to the nondestructive testing of artificial graphite electrodes for electrolysis.
From the results, it was concluded that the penetration method was suitable for the detection of “stratified flaws” in the material. It was obserbed that the attenuation of the ultrasonic wave by the material which had many flaws was much rapid than the attenuation by other materials which had not any flaw.
The existence of flaws was not always determined definitely by this method, because of the fact that the attenuation time changed continuously depending upon the degree and the number of flaws. However, result of the inspection will be adaptable as an industrial standard for the determination of a grade of the material.
