Weld Acceptance Level
Weld quality group is a quality standard defined in standards like ISO 5817. It defines acceptable limits for irregularities and hardness variations in welds.
Physical-Chemical Mechanism of Action
The weld seam evaluation group indicates how uneven a weld seam runs or which hardness differences between the welds and the base metal are acceptable. These groups are based on the assessment of factors such as waviness, depth, and stress in the weld seam.
Metallurgical Relevance & Welding Risks
A poor evaluation group can lead to uneven cooling, causing hardness differences and potential cracks in the material. Additionally, severe waviness can impair the mechanical strength of the weld seam.
Workshop Practice & Instructions
To ensure a good evaluation group, it is important to carry out welding in a stable environment. The temperature and speed of the welding process should be precisely controlled. If needed, additional samples can be taken and inspected under a microscope to ensure hardness differences are within acceptable limits.