Ultrasonic probe system for detection of delamination defects in the bonding layer of bimetallic seamless composite steel pipe

Abstract

The invention provides an ultrasonic probe system for detecting bimetallic seamless composite steel pipe binding layer delamination defects. The system comprises the following components: an air spring connecting rod which is connected to an external driving mechanism, a probe installation support which is arranged at the other end of the air spring connecting rod, a movable plate for adjusting aprobe which can be movably fixed on the probe installation support, an ultrasonic probe which is installed on the movable plate for adjusting the probe, and a probe meso-position spacing pawl; the probe meso-position spacing pawl and the air spring connecting rod are installed at the same side; the probe meso-position spacing pawl is in an inverted V type, the other two ends of the probe meso-position spacing pawl are provided with rotatable rollers, and the rotatable rollers can move and rotate along spiral of detected steel pipes. The system overcomes the phenomenon that detection results are influenced by transmission system errors, steel pipe linearity errors, steel pipe cylindricity errors, or the accumulative errors which exceed the standard during spiral forward movement of the steel pipes, detection cost is greatly reduced, accuracy of detection results is ensured, and at the same time, the system is suitable for detecting binding layer delamination defects of composite steel pipes of different diameters.

Description

technical field [0001] The invention relates to the technical field of ultrasonic non-destructive testing, in particular to an ultrasonic probe system for detecting the delamination defect of a joint layer of a bimetallic seamless composite steel pipe. Background technique [0002] The bimetallic composite pipe has the advantages of impact resistance, low thermal expansion rate, pressure resistance, high temperature resistance, mature installation, and complete specifications. It has been widely used in oilfield, chemical, electric power and other industrial fields. The economic, environmental and social benefits are also more obvious; however, if the delamination phenomenon occurs on the double-layer metal joint surface, it will bring great damage to the strength of the composite steel pipe and affect the operation safety of important applications; therefore, strengthening the bi-metal composite pipe Quality control is necessary for both manufacturers and users. [0003] T...

AI Technical Summary

Problems solved by technology

[0004] In the existing ultrasonic testing equipment for delamination of the bonded layer of bimetallic composite pipe, there are mainly two methods for realizing the relative helical motion of the probe and the steel pipe; one is that the ultrasonic probe rotates at a fixed axis at high speed while the steel pipe moves in a straight line at a uniform speed; One is that the steel pipe itself advances spirally, and the probe remains fixed; the first method has higher detection efficiency and detection accuracy, but the processing cost, use and maintenance cost of the equipment are also high; the second method has lower processing cost, use and maintenance cost, However, the detection accuracy is relatively low. The main reason is that when the steel pipe spirals forward, the straightness does not meet the requirements, which causes the steel pipe to vibrate on the track, which has an unpredictable impact on the ultrasonic detection results, and often causes missed or false reports of defects.

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