| 摘要 |
An ultrasonic inspection system is disclosed for inspecting an elongated weld, such as the long seam weld on pipe. Longitudinal wave ultrasonic transducers are provided for inspecting along the thickest portion of the weld and along the plate adjacent to the weld, and shear wave ultrasonic transducers are provided for inspecting the boundary zones between the weld metal and plate being welded. Electronic pulsing and signal processing apparatus is provided for providing drive to a data recorder on which separate graphical representations of the condition of the weld, of the condition of the plate adjacent the weld, and of the boundary zones of the weld are simultaneously provided. The transducers are mounted on an inspection head which is in turn mounted on a carriage which may be inserted into racked pipe for inspecting the long seam weld. The inspection head includes guide means, such as rollers, for guiding the head along the long seam weld of the pipe. The inspection head is resiliently urged against the inside wall of the pipe and counterweights are provided for balancing the inspection head in the position required for inspection so that the seam may be inspected when the pipe is at any rotational orientation.
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