Main technical performance of the equipment
1, flaw detection sensitivity: from the workpiece surface to the metal extension depth ≥0.05mm, length ≥2mm crack, defect; For the crack inside the metal which has not extended to the surface of the workpiece, when the metal thickness between the crack upper edge and the surface of the workpiece is ≤0.2mm, the crack depth ≥0.2mm, the crack length ≥2mm can be detected.
2. Leakage rate: 0%, that is, 99.99% of unqualified products are removed; Misjudgment rate ≤1%. All rejected items can be inspected once again to reduce misjudgment.
3, Detection frequency range: 100Hz~1MHz, adjustable
4, Band-pass filtering, center frequency 250~100KHz, 8 levels
5. Gain: Gain of each channel is 0~60dB, adjustment amount is 1dB/ gear
6, phase: 0°~360°, step distance is 1°
7, dual channel detection heartache is independent of each other, without mutual interference
Principle of Eddy Current Testing: Eddy current testing uses the principle of electromagnetic induction to excite the probe coil with sinusoidal current. When the probe is close to the metal surface, the alternating magnetic field around the coil generates induced current on the metal surface. For flat metal, the flow of the induced current is a concentric circle of coils, shaped like a vortex, called an eddy current. The eddy also generates a magnetic field of the same frequency, in the opposite direction of the coil's magnetic field. The loss resistance of the eddy current channel and 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 and size, the reaction of eddy current magnetic field to the coil is different, resulting in changes in coil impedance. By measuring such changes with eddy current testing instruments, the metal surface can be identified with defects or other physical property changes. There are many factors that affect the eddy current field, such as the degree of coupling between the probe coil and the material under test, the shape and size of the material, electrical conductivity, magnetic permeability, and defects. Therefore, the problems of flaw detection, thickness measurement and sorting of metal materials can be solved by using eddy current principle
Technical parameters: flaw detection sensitivity: from the workpiece surface to the metal extending depth ≥ 0.05mm, length ≥2 mm crack, defect; When the thickness of the metal between the top edge of the crack and the surface of the workpiece is ≤ 0.2mm, the crack with a depth of ≥0.20mm and a length of ≥ 1mm can be detected.
渦流探傷是由交流電路造成的交替變化電磁場功效于待探傷檢測的導電性原材料，磁感應出電渦流。假如渦流探傷校準原材料中有缺陷，它將影響所造成的電渦流，即產生影響信號。用渦流探傷儀檢驗出其影響信號，就可了解缺陷的情況。渦流的要素許多 ，就是說渦流中乘載豐富多彩的信號，這種信號與原材料的許多 要素相關，如何把在其中有效的信號從眾多的信號中檢驗缺陷，這一便是德國渦流探傷儀的終始目地。但是渦流探傷對導電性原材料功效較明顯，對磁鐵原材料的實際效果就較為差。此外，工件表面的光滑度、平面度等對渦流探傷都是有很大危害，因此有其一定的缺陷性。