Welding Quality Class
The weld quality class indicates how much a welded joint can be stressed and which tests are required. Higher classes mean more safety and require strict testing.
Physico-chemical mechanism
Weld quality class is a classification of welded joints based on their stress level and safety relevance. It indicates how much load the joint can withstand and what testing is required to ensure its quality.
Metallurgical relevance & risks when welding
Higher weld quality classes require rigorous non-destructive and destructive testing. These tests ensure the joint is stable and safe. Incorrect classification or insufficient testing can lead to cracks or failure in the weld.
Workshop practice & instructions
Each weld quality class has specific testing frequencies and methods. For example:
• Class 1: Non-destructive testing with a minimum frequency of 20 %.
• Class 2: Destructive testing with a minimum frequency of 30 %.
• Class 3: Destructive testing with a minimum frequency of 40 %.
It is important to carry out the proper classification and testing to ensure the weld withstands the required stress level.