Airtightness testing is an essential task before the production and delivery of many industrial products. According to different product specifications, shapes, uses, and waterproof grade requirements, different testing methods such as positive pressure testing, negative pressure testing, differential pressure testing, observation method, etc. can be selected. What factors can affect the accuracy of air tightness testing results in industrial products?
1、 Temperature stability
During the airtightness testing of the workpiece, it was found that temperature fluctuations have a significant impact on the quality of product leakage testing. Due to the fact that many test process designs for workpieces require cleaning before the airtightness testing process. Due to the temperature control of the automatic cleaning machine and the layout of the cooling channel, it is possible that the temperature of the workpiece before testing may not match the required measured temperature, thereby affecting the results of the airtightness test. The main manifestations are high or low temperature of the body itself, uneven temperature at various sealing points on the surface of the body, and excessive temperature changes in the on-site environment. Although the degree of influence of temperature on the measurement results of different workpieces varies depending on the size of the product cavity, overall, temperature is the main factor affecting the accuracy of the detection results during the measurement process.
2、 Detecting volume stability
If there are volume fluctuations during the airtightness testing of the workpiece, it will affect the accuracy of the testing results. The so-called volume fluctuation refers to the volume change fluctuation caused by the deformation of the testing chamber or sealing area after the product is sealed. If the rubber seal of the fixture deforms during the airtightness testing process, it will affect the internal pressure of the cavity and directly affect the leakage value detection results of the product.
3、 Stability of humidity
The influence of humidity stability on the results of airtightness testing is mainly caused by affecting the gas density and sealing performance during the testing process. When the tested workpiece or environmental humidity is too high, the gas density inside the workpiece cavity increases, and the air flow between the seals and the mixing points will decrease, resulting in a smaller air tightness test result.
4、 Gas path sealing stability
In the process of conducting airtightness testing on workpieces, if there is a situation where the seals are damaged and not replaced in a timely manner due to the production process, it may be due to insufficient clamping force of the cylinder fixture or leakage in the gas supply and testing pipelines. These situations will directly affect the results of the airtightness test. In general, the leakage value detection of seals in this situation often shows a significant upward trend, which is easy to detect and repair.
The above are the main factors that affect the accuracy of the airtightness testing results of workpieces. Before testing the sealing performance of the workpiece, only by fully understanding relevant knowledge and avoiding related influencing factors can we effectively avoid deviations in the airtightness test results caused by external environmental factors.
Suzhou Loho Electronic Technology Co., Ltd. specializes in airtightness detectors, airtightness detectors, leak detectors, airtightness leak detectors, airtightness testers and other equipment. They are widely used, have fast detection speed, and are suitable for sealing, waterproofing, airtightness, leakage and other fields. Welcome to inquire by phone: 189-1262-8676
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