Vacuum brazing helium mass spectrometry leak detection: a key step to ensure welding quality

Vacuum brazing is a brazing method carried out in an oxygen-free environment. It has many advantages. For example, it significantly improves the corrosion resistance of products, enables high-strength connections, provides good sealing performance, and offers high-temperature resistance. Moreover, it does not require complex flux cleaning processes, reducing production costs. However, during the vacuum brazing process, due to the presence of tiny defects or cracks on the surface of materials, gas leakage may occur, affecting the welding quality. Therefore, in order to ensure the welding quality, a helium mass spectrometer leak detector needs to be used for leak detection.

Helium leak detection is a commonly used non-destructive testing method. It takes advantage of the low molecular weight and extremely small atomic radius of helium, which allows helium to enter the interior of the welded joint through tiny defects or cracks. After helium enters the joint, a helium leak detection instrument can be used to detect the leakage of helium. If there is a leak, helium will escape from the defects of the joint and be detected by the helium mass spectrometer leak detector.

When using a helium mass spectrometer leak detector for leak detection in vacuum brazing, the negative pressure mode is selected, and the minimum detectable leak rate can reach: 5×10^-13 Pa· m³/s.

Advantages of Helium Leak Detection

The advantages of helium leak detection lie in its high sensitivity and accuracy. Due to the small molecular weight of helium, even tiny defects or cracks can be detected. In addition, the content of helium in the atmosphere is extremely low, and it will not cause pollution to the environment. Therefore, helium leak detection has become a commonly used quality control method in vacuum brazing.

Principle of Helium Leak Detection

The principle of helium leak detection is based on the physical properties of gas diffusion and leakage. After helium enters the joint, due to the pressure difference, helium will escape through the defects or cracks. By detecting the escaped helium, it is possible to determine whether there is a leakage problem in the welded joint. Helium leak detection instruments usually use mass spectrometers or gas detection instruments for detection, which can accurately locate and measure the location and quantity of helium leakage.

In summary, the advantages of helium leak detection in vacuum brazing are its high sensitivity and accuracy, which can effectively detect the leakage of welded joints and ensure the welding quality.

Nuoyi's helium mass spectrometer leak detector is deeply loved by many vacuum brazing enterprises due to its advantages such as high detection sensitivity and fast leak detection speed.

With its excellent quality and stable performance, it has been widely applied in many industries. Regardless of the industry, the helium mass spectrometer leak detector can provide enterprises with efficient and accurate detection services, making production safer and more reliable.