Customization requirements and attention points of fluorescent magnetic particle flaw detection machine

The customization of fluorescent magnetic particle flaw detection machine equipment should be as convenient as possible for operation while meeting the detection requirements. Different manufacturers may take different ways to achieve the same function, before equipment customization, as much as possible to learn from the same industry experience, while putting forward technical requirements, should be as detailed as possible.

Note: We put forward the time adjustment, temperature adjustment and other control requirements when customizing the immersion fluorescent penetration detection line, but when the manufacturer realizes this function, it does not put the corresponding adjustment function on the tank control panel, but on the total control cabinet, although it does not affect the overall function, it causes the adjustment to remain unchanged.

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.

The measuring principle of fluorescent magnetic particle flaw detection machine in special cases

Partial fluorescent magnetic particle flaw detection machine, which is collected by magnetic marks formed by magnetic permeability changes of data; In a special case, magnetic particles accumulate on the boundary surface of two different data. Segregation of carbide layer; Magnetic marks at abrupt changes in the section size of parts; The magnetizing current is too high, and the magnetic mark formed by the metal flow line; Spotty magnetic marks caused by unclean or oil stains on the surface of the workpiece.

What is the general process of magnetic particle inspection? The scope of application of the procedure; Magnetization method (including magnetization standard, workpiece appearance preparation); Magnetic powder (including particle size, color, preparation of magnetic suspension and fluorescent magnetic suspension). Test piece, technical operation, quality assessment and inspection records. What are the detection methods?

1, select any main plane for detection, and scan along the center of the grid lines perpendicular to each other, the grid line spacing is 200mm, and the strip area with a width of 50mm should be 100% scanned along the edge of the board.

2, the near surface defects of the measurement plane should be detected on the other side of the plate when the detection time is selected.

3. In the process of scanning, if the back echo completely disappears and accompanied by continuous signal display, all areas of adjacent squares with discontinuous signal display should be scanned 100%. The actual boundary of the area where this state exists should be: Move the probe away from the center of the discontinuity until the back echo is equal to the discontinuity echo, mark there, and repeat until the entire boundary is determined.

4, another method to determine the defect boundary: move the probe to find the electromagnetic wave, and then use the half-wave height method (6dB) to determine the boundary.

5, the determination of the boundary is determined by the connection of the probe center point.

Fluorescent magnetic particle detection line technology explanation:

Fluorescent permeation detection lines are used to detect defects on the surface of the workpiece through the penetration of liquid into microholes. Fluorescent permeation detection (PT), also known as penetration detection, is a non-destructive method for detecting surfaces based on the principle of capillary action with open defects. This method is a non-destructive testing method of five kinds (ray flaw detector, ultrasonic flaw detector, magnetic particle flaw detector, fluorescence detection line, eddy current flaw detector), is a comprehensive science and technology.

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