Nondestructive examination method for variable cross-section combined workpiece of oil level annunciator
An oil level indicator and non-destructive testing technology, applied in the direction of material analysis using radiation, can solve problems such as waste of rework, inability to detect thin layer defects, and impact on the detection rate of crack defects. The method is simple and the cost is improved. The effect of high image clarity, sharpness and sensitivity
Active Publication Date: 2014-12-24
四川泛华航空仪表电器有限公司
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Problems solved by technology
The shortcomings of the prior art radiography method are: a) The detection rate of crack defects is affected by the angle of transillumination, and thin-layer defects in the vertical direction of irradiation cannot be detected, such as delamination of steel plates
There are quality problems or hidden dangers in the oil level signal that are not easy to be found, and will bury certain hidden dangers in the future, resulting in a huge waste of rework and traceability of responsibilities
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[0016] refer to figure 1 . The present invention will be further illustrated in the following examples, which are only used to illustrate the present invention and not to limit the present invention.
[0017] In the embodiments described below, the oil level signal is a typical workpiece, and it is a radiographic inspection of variable cross-section workpieces. Contains metal aluminum 1, epoxy resin 2, float with magnet 3, glass sintered reed switch 4. The oil level indicator is an important part of the aviation fuel measurement and control system. The main principle is that when the oil level changes, it will drive the magnetic float to move. When the magnetic float reaches the agreed oil level, the magnetic float will attract the dry reed switch fixed there, send a switch signal, and connect the whole circuit, so as to realize the function of oil level measurement. The X-ray transillumination of the oil level signal is not only the inspection of the variable cross-section...
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The invention provides a nondestructive examination method for a variable cross-section combined workpiece of an oil level annunciator, and aims to examine positions of a magnet and a reed pipe of an oil level annunciator product as well as the state of a reed of the reed pipe through X-ray radiography, so as to determine whether the reed can be normally actuated, and the welding spot quality between the reed pipe and a wire is good or not. The nondestructive examination method is implemented by the technical scheme as follows: during X-ray examination, firstly determining transillumination parameters, in which the tube voltage is set to be 70 KV, the tube current is set to be 4 Am, the transillumination time is set to be 1 min, and the photographic density is set to be 1.2-2.5; taking a photographic plate as a recording medium, placing the photographic film on a lead plate, and placing the lead plate under the oil level annunciator, placing an image quality indicator and a marker well, adopting a fixation manner to enable the transillumination zone plane of each oil level annunciator to be perpendicular with the incident rays, keeping a tangent plane the main plane of the transillumination zone plane of the oil level annunciator or a curve to be parallel to and close to the photographic film plane, and conducting perpendicular transillumination every 60 degrees to enable the photographic film to sense the rays under the action of the trans-illuminated rays.
Description
technical field [0001] The invention relates to a non-destructive testing method for a variable cross-section workpiece assembly (including metal aluminum, plastic grease, and glass sintered material) of an oil level signal device, which can detect the position of the magnet in the oil level signal device, the position of the reed tube, and the reed switch. The state of the reed, the quality of the solder joints between the reed switch and the wire, etc. are inspected. Background technique [0002] Radiographic Testing, referred to as RT by industry insiders, is an important professional category of industrial nondestructive testing (Nondestructive Testing). The main application of radiographic inspection is to detect macroscopic geometric defects inside the workpiece. According to different characteristics, radiation detection can be divided into many different methods, for example: X-ray tomography (X-CT), computer radiography (CR), radiography, and so on. There are thre...
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Inventor 蒲英
Owner 四川泛华航空仪表电器有限公司