In the field of precision seamless carbon steel pipe inspection technology, precision seamless carbon steel pipe refers to the outer diameter of less than φ100mm carbon steel precision seamless steel pipe. Precision seamless carbon steel pipe is auto parts, chemical, heat, boiler, mechanical hydraulic Industry important timber.
Through the coil eddy current detection is a precision seamless carbon steel pipe surface of a circumferential surface. In the use of through the coil of the eddy current testing, the precision of the seamless steel pipe is detected, the greater the area of the coil detection, the lower the signal to noise ratio. It is for this reason, the carbon seamless steel pipe eddy current testing standards, the use of through the coil eddy current testing, the external size of not more than 140mm. In addition, large diameter steel pipe through the flaw detection, precision seamless carbon steel tube magnetization and demagnetization and so there is a certain degree of difficulty. Sink ultrasonic inspection is the use of steel spiral forward, ultrasonic probe fixed. Through the sink and the bottom of the pipe was fully water coupling characteristics, to ensure that the thickness of the coupling layer unchanged. However, because the main ultrasonic detection of internal defects on the surface and sub-surface defects in the blind area, resulting in can not be detected, coupled with the use of spiral forward, for 12m long precision seamless carbon steel pipe space occupies 30m space and other deficiencies, has been affecting the steel pipe selection and promotion of detection methods. Therefore, at home and abroad for the detection of precision seamless carbon steel pipe, the general use of magnetic leakage or water pressure experiments.
