| 摘要 |
In the non-destructive testing of still readily deformable steel for interior flaws by ultrasound waves emitted by an ultrasound probe at a roll used for rolling the steel, the ultrasound waves are passed through the roll serving as forward run for the ultrasound waves before they impinge upon the steel to be tested and the ultrasound waves are so oriented that they impinge on the surface of the steel at a point where the steel has the closest contact with the roll and where the maximum slap-back occurs.
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