Basic quality level D per ISO 5817
Simple assessment group D according to ISO 5817 allows greater irregularities in components that are under low mechanical stress and carry static loads.
Physical-chemical mechanism of action
Simple assessment group D defines criteria for the acceptance of irregularities in weld microstructures. This group considers components with low mechanical stress and static loads, allowing a greater tolerance for surface defects and microstructural differences.
Metallurgical relevance & risks in welding
Allowing greater irregularities in assessment group D means that components with this classification are held to less strict geometric and mechanical properties. This can lead to an increased susceptibility to cracks or deformations if the weld is not optimally executed. However, it is important to note that these components must still exhibit a certain mechanical strength and toughness.
Workshop practice & instructions
For components of Simple assessment group D, the following measures should be considered:
• Careful preparation of the weld joint is essential to minimize the number and size of irregularities.
• Welding parameters (temperature, voltage, time) should be precisely maintained to ensure a homogeneous microstructure.
• Subsequent inspection of the components is important to ensure that irregularities are within the acceptable limits.