Comparison between air tightness detector and ultrasonic testing

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Comparison between air tightness detector and ultrasonic testing

Posted Date: 2024-01-27

Air tightness tester and ultrasonic testing are two commonly used non-destructive testing methods. There are some differences in testing purposes, principles and application scope. This article will compare these two detection methods so that you can understand their characteristics and scope of application.

The air tightness tester is a device used to test the gas sealing performance of sealed containers, pipelines and various sealing structures. It uses air pressure difference or flow measurement to evaluate the sealing performance of the part under test by filling the part under test with gas at a certain pressure.

Air tightness detectors are widely used in aviation, automobiles, electronics, household appliances and other fields. They can detect the air tightness of pressure vessels, sealing rings, valves and other sealed containers.


(1) It is easy to operate and can quickly detect sealing failures;

(2) High detection accuracy, suitable for high-precision seal detection;

(3) Quantitative detection can be carried out to accurately assess leakage.


Actual photos of Yuexin Instrument air tightness detector factory

(1) It may be difficult to detect air tightness for some small or complex parts under test;

(2) Require specific testing environments, such as closed spaces and stable pressure environments.

Ultrasonic testing is a method of non-destructive testing that uses the physical properties of ultrasound. It uses the reflection, refraction, diffraction and other characteristics of sound waves to emit ultrasound into the parts being tested to detect defects, structural changes and abnormalities inside the parts being tested. Ultrasonic testing is widely used in non-destructive testing of metals, glass, ceramics and other materials, parts and products.


(1) Suitable for detection of various materials and structures, especially non-metallic materials and complex structures;

(2) Detect minor defects and abnormalities inside the parts being tested;

(3) Simple operation, fast detection speed, suitable for online detection and automated production.


(1) The technical requirements for operators are relatively high and they require certain professional knowledge and experience;

(2) For some specific materials and structures, there may be blind spots in detection or situations that are difficult to judge;

(3) The test results are greatly affected by the operator’s subjective factors.

Therefore, through the above analysis, there are significant differences in the principles and applications of air tightness detectors and ultrasonic testing. The former mainly focuses on the detection of sealing performance and is suitable for air tightness assessment of sealed containers; the latter focuses on non-destructive testing of the internal structure and defects of the tested parts and has a wider scope of application.

In practical applications, appropriate detection methods should be selected according to specific needs. For example, air tightness detectors are a good choice for occasions with high safety requirements such as aerospace and nuclear industries; ultrasonic testing has more advantages in large-scale production fields such as automobile manufacturing and electronics industry, where a large number of products need to be screened quickly or online Non-destructive testing.

Therefore, when selecting an appropriate non-destructive testing method, various factors should be comprehensively considered based on the material, structure, defect type, accuracy requirements and other factors of the tested part.

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