Experiments in Ultrasonic Imaging for Weld Inspection

As part of a program for investigation of ultrasonic visualization techniqnes, a laboratory imaging system was used to determine some practical factors in weld inspection applications. The system used the Vitro‐designed ultrasonic image tube, and experiments were performed both with and without imaging lenses. The test material was 24‐in. steel plate containing a butt weld with flaws that had previously been radiographed for reference. Ultrasonic energy was introduced into the plate as a shear wave through a coupling block. Scatter from defects was detected on a monitor as a two‐dimensional image against a dark background. Image distortion and phantom images were investigated in detail. System performance criteria for a high data rate inspection system were established, and system modifications were specified for meeting these criteria.