Ultrasonic testing for steel quality inspection includes detection of defects in ultrasonic testing purposes and to measure the relevant dimensions for the purpose of ultrasound measurements. The former is widely used, both automated testing, there is manual testing; while the latter applications are very limited.
1, ultrasonic testing
Ultrasonic testing for steel quality inspection includes detection of weaknesses in ultrasonic testing purposes and to measure the relevant dimensions for the purpose of ultrasound measurements. The former is widely used. Both automated testing, there is manual testing; while the latter applications are rarely, and generally to manual measurement based.
2, the eddy-current flaw detection
Eddy current testing method is the industry is commonly used in various fields of non-destructive testing methods. It is built on the theory of electromagnetic induction, without any coupling agent, the specimen can be quickly and automatically detect one hundred percent. This shape rules for seamless steel single specimen, it is all the more powerful tool for the rapid detection of large quantities. Therefore, it has become one of the indispensable means of various types of steel quality inspection. Suitable for automated quality inspection pipe eddy current testing methods are a little probe testing method and pass through two kinds of probe testing method. The former uses point probe method to detect high-speed rotation of the vertical pipe defect detection rate by the quantity and speed of rotation of the probe may be, generally speaking more slowly, plus equipment is more complex, and therefore its use is not widespread; while the latter is used to detect the probe through the pipe in the transverse defects, this method simple equipment, testing speed (generally up to 60 m / min or more), and the common defects of the pipe surface and near surface, such as cracks, concave , scarring and some outside the fold, such as a higher detection sensitivity, thus becoming one of the main pipe inspection method. Also, due to the eddy current method is particularly sensitive to the through-hole, so it is one of the provisions of the applicable standard main method instead of steel pipe pressure tests.
3, magnetic flux leakage testing
Magnetic flux leakage inspection is based on non-destructive testing techniques ferromagnetic magnetic change. When the ferromagnetic material is magnetized due to a leakage magnetic field will produce defects in the surface, and therefore, by detecting the magnetic flux leakage can be found in defects in the material. Steel pipe magnetic flux leakage detection techniques can be divided into magnetic particle inspection method and magnetic fields measured in two methods. The former is simple, but requires the naked eye to observe the magnetic marks. It is difficult to automate. Although the concluding device complexity, high cost and difficult operation, but it is picked up by the sensor information leakage magnetic field, and therefore easy to automate testing, automated testing for large quantities of steel pipe. Therefore, under normal circumstances, unless otherwise specified, steel pipe magnetic flux leakage testing usually refers assay.
Post time: Oct-08-2019