Straight Seam Welded Steel Pipe Weld Flaw Detection Method

In order to detect the transverse or longitudinal defect of the weld of LSAW steel pipe longitudinal seam, ultrasonic testing was carried out by jet (water column) coupling. Jet (water column) ultrasonic flaw detection is the probe and the pipe through the jet coupling between the probe issued by the longitudinal wave beam through the water or steel interface into the steel pipe, through the waveform conversion of the steel pipe welds pure shear wave detection.

Therefore, the realization of the structural steel pipe in the pure shear wave detection, the probe angle of incidence must be between the critical angle and the critical angle between the II, can be derived from the law of refraction. The critical angles of the first and second critical angles of incident longitudinal waves from the water to steel are calculated to be 14.5 °and 27.3 °, respectively.

Longitudinal welded pipe Ultrasonic Inspection: Nondestructive testing is on-site testing, fast and non-destructive, without the need to arrive at the laboratory, greatly improving efficiency. The analysis speed is much faster than a benchtop spectrometer, and the results are displayed in seconds. Small size, light weight, easy to carry.

There are many kinds of nondestructive testing of ultrasonic flaw detection. The flaw detection principle of longitudinal seam welded steel pipe is not divided into: ultrasonic flaw detection, X-ray flaw detection and film flaw detection. Detection methods are: single-sided double-sided flaw detection, double-sided double-sided flaw detection, single-sided detection.