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The seamless tube is characterized by a large diameter and a relatively thick wall thickness. Therefore, according to this feature, the combination of ultrasonic detection inside and the characteristics of the eddy current detecting surface and the subsurface can be used to realize the "no blind zone" flaw detection. By adopting the "combination method of in-situ rotation of the steel pipe and detecting the advancement of the probe", not only the problem of detecting the title but also the space for occupying the occupied space is solved.
Therefore, at home and abroad, for the detection of seamless pipes, magnetic flux leakage or water pressure experiments are generally used. In China, there is no good performance of magnetic flux leakage testing equipment suitable for seamless pipes. Once used, it needs to be imported. Imported magnetic flux leakage testing equipment is expensive, and it is difficult for most domestic enterprises to accept; and the hydraulic pressure test has low efficiency and high labor intensity, especially when the operator's responsibility is not high, the water pressure test is ineffective. It can be seen that the detection of large-diameter seamless steel pipes has become an urgent problem to be solved in the metallurgical steel pipe industry.
The sink type ultrasonic inspection adopts a steel pipe spiral advance type, and the ultrasonic probe is fixed. The thickness of the coupling layer is ensured by the characteristics of sufficient water coupling between the water tank and the bottom of the steel pipe to be inspected. However, because the ultrasonic mainly detects the internal defects, there is a blind zone on the surface and subsurface defects, which makes it impossible to detect. In addition, the use of the spiral advance type requires a space of 30 m for a 12 m long steel pipe, which has always affected the selection of the steel pipe detection method and Promotion.
The eddy current through the coil is detected by a circumferential surface of the surface of the steel pipe. In the eddy current flaw detection using the through coil, the larger the diameter of the steel pipe to be inspected, the larger the circumferential area detected by the coil, and the lower the signal to noise ratio. It is for this reason that the standard for eddy current testing of steel pipes stipulates that the eddy current flaw detection of the through-coil can not exceed 140 mm. In addition, in the seamless pipe through-type flaw detection, the magnetization and demagnetization of the steel pipe have certain difficulties.
At present, the detection of seamless steel tubes for high-pressure boilers in China's metallurgical industry is mainly applied to the specifications below φ160mm, and most of them adopt the traditional eddy current testing or independent sink ultrasonic testing methods. For the seamless steel pipe exceeding φ160mm, the traditional through-flow eddy current method is used for testing. There are many title topics, which are not allowed by national standards. If independent ultrasonic testing is used, the ultrasonic detection mechanism has a blind zone with a certain depth on the surface, and the reliability of the overall inspection result of the steel pipe cannot be guaranteed.