| 摘要 |
PROBLEM TO BE SOLVED: To obtain an ultrasonic inspection method in which bonding characteristic such as strength, toughness or the like of a bonded material to be measured can be estimated nondestructively, by measuring attenuation amount of ultrasonic waves at a time when the ultrasonic waves are transmitted through the bonding interface of the bonded material to be measured. SOLUTION: In a bonded material 1 to be measure, e.g. steel pipes 2, 3 are bonded at their pipe end faces. An ultrasonic oscillating probe 5 and a receiving probe 6 are arranged so as to sandwich a bonding interface 4. The attenuation amount of ultrasonic waves at a time when the ultrasonic waves which are oscillated by the ultrasonic oscillating probe 5 are transmitted through the bonding interface 4 so as to be received by the receiving probe 6 is measured. On the basis of its measured value, bonding characteristic of the bonded material 1 to be measured is inspected by the correlation between the attenuation amount of ultrasonic waves in a standard bonded material bonded by a known bonding condition measured in advance and the bonding characteristic. As a result, the bonding characteristic such as the bonding temperature, the bonding strength or the like of the bonded material 1 to be measured can be estimated with high accuracy. When this method is applied to the inspection of an oil well pipe, a chemical plantpipe or the like, the reliability of a bonding process can be increased. |
