In the vacuum test, butt, lap and corner welding joints are controlled by using the artificial pressure difference to be created in the tank or similar parts that require impermeability. With the help of the foaming liquid, the pressure difference to be created by the vacuum device in the welded area, and the formation of bubbles in the area with the error, allowing a visible error detection.

It is required to be carried out under the control of mechanical engineers who have a level 2 certificate in accordance with the qualification and certification standard of TS EN ISO 9712 Non-Destructive Testing (NDT) personnel.

In order for the vacuum tests to be performed to give reliable and healthy results, the procedures should be carried out in accordance with the standards.