Defect detection method of paint aluminum alloy frame plate

Abstract

The invention discloses a defect detection method of a paint aluminum alloy frame plate. The method is characterized in that an artificial defect reference sample is processed and manufactured by selecting an actual alloy part with a material, a thermal treatment state and a surface state the same as those of a detected part, and a group of insulation membranes with clear thickness is manufactured; the defect detection method comprises the following steps: firstly measuring the thickness of a paint membrane of the detected part, covering the reference sample with the insulation membrane (with the thickness being equivalent to that of the paint membrane of the detected part) to simulate the paint membrane, and then putting a probe of an eddy current flaw detector on the reference sample with the artificial defect being equivalent to defect to be detected and adjusting detection sensitivity; and finally detecting the defect of the detected part by using the eddy current flaw detector with adjusted detection sensitivity. By adopting the group of insulation membranes with the clear thickness for simulating protective coatings, the detection efficiency is improved; meanwhile, the thickness of the membranes is easy to control, thereby improving accuracy of detection data.

Description

technical field [0001] The invention relates to a method capable of accurately detecting whether there are open cracks or corrosive defects in a painted aluminum alloy frame plate, and belongs to the technical field of detection. Background technique [0002] Used aluminum alloy frame panels often have open cracks or corrosion defects, so they need to be inspected during the repair process. Since the inspected part is usually located on a non-detachable structural component, and sometimes located in a location with poor accessibility, eddy current testing is often used to detect the use defects of aluminum alloy frame panels. [0003] The eddy current testing method is mainly used to detect surface and near-surface defects of conductive materials. It is not necessary to remove the protective layer during testing, but the sensitivity of eddy current testing is closely related to the thickness of the cover layer on the surface of the frame plate. If the comparison sample uses ...

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Problems solved by technology

[0003] The eddy current testing method is mainly used to detect surface and near-surface defects of conductive materials. It is not necessary to remove the protective layer during testing, but the sensitivity of eddy current testing is closely related to the thickness of the cover layer on the surface of the frame plate. If the comparison sample uses a sprayed paint layer to simulate coverage Then, since the thickness of the sprayed paint layer is fixed, spraying paint layers of different thicknesses on the comparison sample is a waste of time and it is difficult to grasp the thickness, and the detection efficiency is low and the effect is not good.

[0004] In addition, the existing painted eddy current testing technology does not determine the minimum detection defect equivalent, so the testers not only cannot determine the detection sensitivity, but also cannot guarantee the reliability of the test results

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