a new method to measure the wall thickness of welded steel pipe

by:Marslite     2019-12-13
The device consists of a measuring head of a laser ultrasonic measuring device, an excitation laser, an irradiated laser, and a converged optical element used to collect reflected light. . .
The device consists of a measuring head of a laser ultrasonic measuring device, an excitation laser, an irradiated laser and a converged optical element used to collect light reflected from the surface of the pipe to the measuring head.
The important quality parameter of pipe production is wall thickness.
Therefore, in the process of pipeline production, it is necessary to measure and monitor its parameters.
You should create a Laser ultrasonic measurement to measure the wall thickness of the welded steel pipe.
It is a measurement method based on pulse echo principle that ensures wall thickness by measuring the propagation time of ultrasonic pulse.
The device uses an excitation laser to introduce an ultrasonic pulse into the surface of the pipe.
This ultrasonic pulse is then transmitted to the pipe and reflected on the inner wall.
We can measure the signal returning to the outer wall by targeting the irradiated laser at the surface of the coated steel pipe.
This reflection signal will be sent to an interferometer with a concentric interferometer.
The analysis and processing device ensures the time difference between the input ultrasonic signal and the reflected ultrasonic signal to determine the wall thickness value in the case of known speed of propagation in the pipeline.
In order to enable the device to accurately and stably measure the wall thickness of welded steel pipes, it is necessary to make the Laser ultrasonic measuring device work under optimal working conditions.
It is a prerequisite that the beam sent by the excitation laser and the beam sent from the irradiated laser must meet at the designated place.
First, however, we must try our best to keep the distance between the measuring pipe and the measuring head accurate.
In addition, practice has proved that it is difficult to ensure the best working condition in the above environmental conditions, especially in the rolling process, and the Laser ultrasonic measuring device cannot be adjusted.
This can only be achieved through regular control of the device.
Otherwise, the distance between the measuring head of the Laser ultrasonic measuring device and the surface of the pipe must be kept in the ideal index value to ensure that the reflective laser from the surface of the pipe is best entered into the measuring device.
Set at least two light resources that send the same bundled light and fix it in different positions of the measuring head.
Like this, at least two light sources can be fixed on the measuring head and direction correction can be performed.
That is, when there is a distance in advance between the pipe and the measuring head, the bundled light from both sources will pass through the surface of the welded steel pipe.
No matter how long the distance between the head and the surface is, you can easily measure it with the above method.
Therefore, it can be determined that the Laser ultrasonic measuring device has the best working state under rough rolling conditions, which improves the productivity and quality of welded steel pipes.
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