Precautions and requirements of magnetic particle flaw detection machine

1. The universal magnetic particle flaw detection machine should remove all dust and dirt on the surface of the object to be measured and remove paint and other covers before measurement. The rough surface will cause the measurement error of the universal magnetic particle flaw detector, and even cause the universal magnetic particle flaw detector to have no reading.

2. The surface of the material to be measured should be smooth as far as possible before the measurement of the universal magnetic particle flaw detection machine. The universal magnetic particle inspection machine can also use high-viscosity couplings. When measuring cylindrical materials, such as pipes, oil drums, etc., it is ideal to choose the axis of the probe and the axis of the measured material. The universal magnetic particle flaw detection machine coupling the probe with the material to be measured, and then rotate the probe around the axis of the object to be measured or move the probe perpendicular to the axis of the object to be measured parallel to the probe, the universal magnetic particle flaw detection machine makes the middle line of the probe delay block contact with the object to be measured, as the accurate thickness of the material.

3, for different diameters of the tested object: the universal magnetic particle flaw detection machine chooses different delay blocks for measurement will be helpful. The universal magnetic particle inspection machine can cover the surface of the object under test with a piece of fine sandpaper and then move the probe back and forth. In order to obtain a satisfactory ultrasonic response, the other surface of the material to be measured must be parallel or coaxial with the surface to be measured, otherwise the universal magnetic particle inspection machine will cause measurement errors or no reading display at all.

4, the thickness of the universal magnetic particle inspection machine material and ultrasonic propagation speed are affected by temperature, if the measurement accuracy of the universal magnetic particle inspection machine is higher, the test block comparison method can be used to correct the measured value of the measured workpiece with this coefficient.

5, for some such as fiber, porous, coarse particle materials, they will cause a large number of ultrasonic scattering and energy attenuation, universal magnetic particle inspection machine resulting in abnormal reading or even no reading, in this case, it means that the material is not suitable for this universal magnetic particle inspection machine test.

Factors affecting the magnetic particle detection effect of magnetic particle detection machine:

1, the size and direction of the magnetic field;

2. Selection of magnetization method;

3, the selection of magnetic powder;

4. Concentration of magnetic suspension;

5, the function of the equipment;

6, workpiece shape and surface roughness;

7. Magnetization time and operation

8, the nature and shape of the defects;

9. The nature of flaw detection personnel;

10, lighting conditions.

The inspection line of the flaw detection machine includes pre-cleaning tank, drying tank A, osmotic drop tank, pre-washing tank, emulsifying tank, final cleaning tank, drying tank B and developing cabinet. The water pressure, air pressure and temperature of the testing equipment must be displayed and meet the requirements of industry standards.

Since the final cleaning needs to be carried out under a black light, a dark room environment and black light equipment must be provided in the final cleaning process to facilitate the inspection of the cleaning effect.

Magnetic particle inspection machine to detect a wide range of common types of probes in daily use have the following components:

1, magnetic particle inspection machine straight probe

The single wafer used for analytical vertical inspection as the probe can be mainly used to generate longitudinal wave inspection. The straight probe is composed of socket, shell, protective film, piezoelectric wafer, acoustic structure material, etc. The head contact surface is replaceable soft film, which is used to detect the workpiece with rough cell surface.

2. Inclined probe of magnetic particle flaw detection machine

The probe for oblique beam detection is mainly used for shear wave detection... The inclined probe is composed of a inclined block, a piezoelectric wafer, a sound absorbing material, a shell, a socket, etc. The beam of the inclined probe is tilted toward the probe surface and can be used to detect locations where a straight beam cannot reach, or areas where there is an Angle between the direction of the defect and the detection surface.

3, magnetic particle inspection machine diameter tube probe

The single crystal micro shear wave inclined probe is used for the inspection of welded joints of small diameter thin wall pipes. The testing method standard can refer to the Chinese power enterprise industry development standard DL/T8202002 "Pipeline system welding joint by ultrasonic inspection information technology working procedures", suitable for their own detection of pipe diameter ≥32mm, less than or equal to 159mm, wall thickness ≥4mm, less than 14mm small-diameter thin-walled pipe; It can also be applied to the detection of similar engineering pipelines in some other related industries. The probe shape design size is small, the horizontal distance of the front edge is less than 5mm, the initial pulse width is less than 1.5mm (equivalent to the steel depth), and the resolution is greater than the cost is equal to 20dB. According to the different pipe diameter of the tested equipment, the detection surface is machined into a radian corresponding to the pipe diameter.

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