Main technical performance of the equipment

1. Sensitivity of flaw detection: Cracks and defects with a depth of ≥ 0.06mm and a length of ≥ 2mm extending from the surface of the workpiece into the metal; For cracks inside the metal that have not yet extended to the surface of the workpiece, cracks with a depth of ≥ 0.2mm and a length of ≥ 2mm can be detected when the metal thickness between the upper edge of the crack and the surface of the workpiece is ≤ 0.2mm

2. Misjudgment rate: 0%, which means 99.99% of non-conforming products are removed; Misjudgment rate ≤ 2%. All rejected products can be retested once to reduce misjudgment.

3. Detection frequency range: 100Hz~1MHz, adjustable.

4. Band pass filtering, center frequency 250-1000KHz, 8 levels

5. Gain: Each channel has a gain of 0-60dB, with an adjustment of 1dB per level

6. Phase: 0 °~360 °, with a step distance of 1

Principle of eddy current testing:

Eddy current detection is the application of electromagnetic induction principle, which excites the probe coil with a sine wave current. When the probe approaches the metal surface, the alternating magnetic field around the coil generates induced current on the metal surface. For flat metal, the direction of induced current is a concentric circular coil, resembling a vortex, called an eddy current. At the same time, eddy currents also generate a magnetic field of the same frequency, which is opposite to the direction of the coil magnetic field. The loss resistance of the eddy current channel, as well as the anti magnetic flux generated by the eddy current, are reflected back to the probe coil, changing the current magnitude and phase of the coil, that is, changing the impedance of the coil. Therefore, when the probe moves on the metal surface and encounters defects or changes in material, size, etc., the reaction of the eddy current magnetic field on the coil is different, causing changes in the coil impedance. By measuring this change with an eddy current detection instrument, the presence of defects or other physical and material changes on the metal surface can be identified. There are many factors that affect the eddy current field, such as the degree of coupling between the probe coil and the tested material, the shape and size of the material, conductivity, permeability, and defects. Therefore, the principle of eddy current can be used to solve problems such as metal material inspection, thickness measurement, and sorting

Technical parameters:

Sensitivity of flaw detection: cracks and defects that extend from the surface of the workpiece to the inside of the metal with a depth of ≥ 0.05 mm and a length of ≥ 2 mm; For cracks inside the metal that have not yet extended to the surface of the workpiece, cracks with a depth of ≥ 0.20mm and a length of ≥ 1mm can be detected when the metal thickness between the upper edge of the crack and the surface of the workpiece is ≤ 0.2 mm.

Eddy current flaw detector precision

Accurately measure conductivity to identify rare metals, review heat treatment processes, determine thermal damage in applications, accurately measure the relative density of powdered metal material parts, and adopt different testing methods based on different testing objectives and application objectives. Develop various types of eddy current testing system software and equipment. The system software and machine equipment of the eddy current testing instrument include detection coils, non-destructive testing ultrasonic testing data signal coupling equipment, eddy current testing instrument, mechanical transmission organization, control panel, and display information recording instrument. Among them, the eddy current detector and control panel belong to a part of the electrical equipment. The mechanical transmission organization belongs to the mechanical equipment, and the operation of a part of the detection coil and data signal coupling equipment is a key part of the connection between the electrical equipment and the mechanical equipment, which is the key to eddy current testing. The detection coil of the fully automatic sealing ring eddy current testing hardness sorting machine is divided into t double beam and scattering type, single coil and double coil, positive and differential protection type, self comparison type and comparison type, fork and point test. Different types of detection coils are installed together.