The non-destructive testing methods for
steel pipes mainly include ultrasonic testing, radiographic testing, eddy current testing, magnetic particle testing, and penetrant testing. Multi-Use Ultrasonic Detection Ultrasonic flaw detection has a high sensitivity to area-type defects inside the steel pipe. It detects the entire wall thickness direction of the steel pipe. The most important thing is that it can detect inner wall defects, which are also beyond the reach of other methods.
Steel pipe flaw detection equipment includes a feeding mechanism, ultrasonic probe and tracking system, flaw detection cross-arm beam and walking system, steel pipe rotating roller system, feeding and pulling device, water supply system, air system, steel pipe inspection, and monitoring system, channel ultrasonic Instruments, electronic control systems, marking systems, etc. The mechanical part is driven by the rotating wheel to rotate the steel pipe, and the probe tracking and detection system walk on the beam through the linear slide rail to complete the detection of the entire steel pipe.
In general metal materials, we cannot observe with the naked eye whether there are defects inside, so ultrasonic flaw detection is used. When ultrasonic waves propagate in metal workpieces, they have reflection characteristics. The ultrasonic waves are reflected on the defect, and the reflected sound wave will be displayed on the display screen, and we can judge the size and position of the defect according to the reflected wave; the directionality of the wave sound is good, and the higher the frequency, the better the directionality. A very narrow beam radiates into the medium, making it easy to locate defects.
During flaw detection, the steel pipe to be tested is hoisted to the loading platform by driving, and the steel pipe is stably placed on the in-situ rotating roller table by the feeding mechanism, and the rotating roller table drives the steel pipe to rotate in place; at this time, the probe and the tracking system move out from the starting position After the sensor senses the pipe, the probe falls to the surface of the steel pipe in turn, and the circumference of the end of the steel pipe is firstly detected. Then the flaw detection system moves in a straight line at a constant speed to detect flaws on the entire steel pipe; after the flaw detection is completed, the flaw detection instrument will give the corresponding flaw detection results, and the flaws will be marked and alarmed; the entire flaw detection process is monitored by the monitoring system to achieve full coverage of the workpiece. After the inspection is completed, the steel pipe is transferred to the unloading stand to complete a flaw detection process. The above is a detailed explanation of the flaw detection of seamless steel pipes. The non-destructive flaw detection of spiral steel pipes is another matter. It is rolled into a tube blank and then welded to form the pipe seam. It can produce large-diameter steel pipes with narrow strip steel. The widely used ultrasonic flaw detection is an important means of quality inspection of spiral welded pipe welds. Want to improve product quality, To ensure the safe use of products, ultrasonic flaw detection is required before leaving the factory.
The spiral welded pipe ultrasonic automatic flaw detection system is suitable for the detection of spiral welded steel pipes with a diameter of 219-1620mm and a wall thickness of 8-16mm. Using computer control and signal real-time acquisition and processing combined technology, using a multi-channel digital flaw detector with the support of a high-speed computer, through the linear slide rail and probe tracking system to detect the relative movement of the probe and the upper weld of the steel pipe in a straight line to complete the welding of the steel pipe Seam and full-pipe flaw detection can realize automatic detection of defects, automatic evaluation of defects, display, and record (defect) echo amplitude, store, and print test data, and automatically generate test reports in the format required by users.
Types of inspection defects: virtual welding, incomplete penetration, internal and external penetrating damage, folds, inclusions, cracks, cracks, pits, and other surface and near-surface defects, etc. Carry out high-precision flaw detection of weld seams. Depending on whether there are defects in the steel pipe, corresponding control signals are given respectively. The electric control of the equipment is controlled by PLC, which has high reliability and can realize automatic flaw detection in the whole process, as well as manual operation and standard sample debugging. Conveying, detection, alarm, etc. all adopt PLC real-time automatic control.
