Sink is the use of ultrasonic detection precision tubes spin forward type, ultrasound probe stationary. Chongqing Precision Pipe Factory technicians mentioned were seized through gutters and precision tubes full of water at the bottom of the coupling characteristics, to ensure the thickness of the coupling constant. But because ultrasonic detection of internal defects on the surface of the main and sub- surface defects exist blind, preventing detection, coupled with spiral forward type, precision tubes for 12m long 30m venue needs such as space shortage has affected the precision tube detection method selection and promotion.
Therefore, the domestic large-caliber precision tubes for the detection, commonly used magnetic flux leakage method or hydrostatic test. In China, good performance is still not suitable for large -caliber precision tubes produced magnetic flux leakage testing equipment, the use of which is imported. Imported magnetic flux leakage detection equipment is expensive, for the majority of domestic enterprises is difficult to accept; while the hydraulic test inefficient, labor-intensive, especially when the operator is not high sense of responsibility, the water pressure test useless. Visible to achieve large-diameter seamless precision tubes metallurgical testing has become the steel industry problems to be solved.
Large diameter pipe is characterized by precision large diameter, wall thickness is relatively thick, so take advantage of this feature under ultrasound and eddy current testing internal surface and subsurface features combine to achieve "blind" testing. Through the use of "precision tubes in situ rotation detection probe forward combinations," not only solve the detection problem, but also solve the narrow space occupied space.
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