Weld Quality Classification
Weld quality classification groups weld imperfections based on expected service loading.
Physical-Chemical Mechanism
Classification assesses the quality of a weld based on factors such as hardness, stress distribution, and microstructure. Irregularities can arise from various causes, such as insufficient melting time or incorrect cooling steps.
Metallurgical Relevance & Risks in Welding
A classification that is too high can lead to an increased risk of cracking and destruction, as it indicates irregular structures or stress areas in the weld. A classification that is too low, on the other hand, can result in lower strength and reduced service life of the component.
Shop Practice & Action Guidelines
When welding, it is crucial to select the correct classification for the specific application. This involves adhering to process parameters such as melting time, cooling steps, and temperature profiles. For high quality, it is important that the weld stays within the critical temperature window to achieve a homogeneous microstructure.