Phased array ultrasonic detection device for small-diameter pipe weld joint and working method thereof

Abstract

The invention discloses a phased array ultrasonic detection device for a small-diameter pipe weld joint and a working method of the phased array ultrasonic detection device, and belongs to the technical field of nondestructive detection of small-diameter pipes. The fixed ring rail is of a two-petal split structure, a compensation block is arranged in a sliding groove in the circumferential direction of the inner side of the fixed ring rail, and the movable scanning sliding block is arranged on the fixed ring rail in a sliding mode; the movable scanning slide block is connected with a size measuring assembly, a probe mounting assembly and a roller encoder; the probe mounting assembly comprises a connecting part and a fixing part, the connecting part is connected with the movable scanning sliding block, the fixing part is connected with the probe clamping device, the probe clamping device is connected with the phased array ultrasonic probe, and the connecting part is connected with the fixing part through a joint mechanism; a roller of the roller encoder is in contact with the outer side of the fixed ring rail; and the phased array ultrasonic probe and the roller encoder are respectively connected to the phased array ultrasonic detector through connecting wires. The phased array ultrasonic detection device is reasonable in structural design, and phased array ultrasonic detectionof butt welds of small-diameter pipes made of various materials and with various pipe diameters can be completed quickly, accurately and stably.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of small-diameter pipelines, and in particular relates to a phased array ultrasonic testing device for welding seams of small-diameter pipes and a working method thereof. Background technique [0002] The diameter of the pipes on the heating surface of a thermal power plant is generally 32-89mm, and the wall thickness is 4-12mm. They are all small-diameter pipes and connected by welding. They have been operating at high temperature and high pressure for a long time, and the service environment is extremely harsh. Pipe burst accidents on the heating surface occur frequently. GB / T16507.6-2013 "Water Tube Boiler Part 6: Inspection, Test and Acceptance" stipulates that the pipe (pipe screen) of p≥9.8MPa ring welded joint should be 100% RT (ray detection) or 100% UT (ultrasonic detection) ) (installation site 50%), however, ultrasonic testing has problems such as low defect detection r...

AI Technical Summary

Problems solved by technology

Due to the poor detection environment of the heating surface of the boiler in the power plant, there are disadvantages such as setting up shelves, working at heights, and limited space. Both linear scanning methods have certain disadvantages in field application.

If both need to carry a ruler to measure the distance of the reference line, it is difficult to fix the magnetic strip and chain roller sliding scanning device at the position of the reference line under the condition of limited detection space. If the distance error does not meet the requirements, it is necessary to repeatedly measure and load. In order to achieve the allowable range of error, the operation is complicated; the magnetic stripe linear scanning cannot accurately measure the scanning distance, and the C-scan imaging detection defect positioning error is large; the hand-held probe scanning along the reference line cannot guarantee the stability of the detection. The phased array ultrasonic C-scan imaging detection of small-diameter pipe butt welds cannot even be completed in the limited area; for large-diameter pipes, when the magnetic strip or chain of the sliding scanning device with chain rollers is long, it is easy to cause magnetic The deviation between the circumferential position of the bar or chain and the reference line is different, which does not meet the standard requirements and affects the results of phased array ultrasonic testing, and the magnetic strip type cannot realize the linear scanning of non-ferromagnetic material pipes. connection method, there are many parts, it is easy to loosen and fall during on-site use, and the price is expensive

Images