Testing Group
The test class determines which tests (non-destructive and destructive) must be performed on a weld, depending on the criticality of the component.
Physicochemical Mechanism of Action
The test class is a classification system that determines the safety and reliability of a weld. It considers both the material condition and the mechanical stresses on the component.
Metallurgical Relevance & Welding Risks
The test class indicates whether and which tests are necessary to ensure that the weld meets required safety standards. A test class that is too low can lead to insufficient testing, which poses risks such as cracks or component failure. A test class that is too high means unnecessary cost and time.
Workshop Practice & Action Instructions
The test class is usually specified by the client or the site manager. Each test class has specific requirements for the type and manner of testing. For example:
• Test class 1: Only visual inspection required.
• Test class 2: In addition to visual inspection, a mechanical test (e.g., penetration test) is required.
• Test class 3: Destructive tests such as radiography or ultrasonic testing are required.
It is important to comply with the specific requirements of the respective test class to ensure that the weld meets the necessary safety standards.