Local Stress Intensity Factor
The local stress intensity factor describes the stress concentration at the crack tip in welded components. It helps in evaluating remaining life and detecting weld defects.
Physical-chemical mechanism of action
The local stress intensity factor (LSIF) is a parameter that quantifies the stress concentration at the tip of a crack in a material. It takes into account the local stresses and the material behavior under mechanical load.
Metallurgical relevance & risks in welding
A high LSIF indicates increased stress concentration at the crack tip, which can lead to fractures and act as a catalyst for further cracking. This can significantly reduce the remaining service life of components and lead to the formation of hot cracks or welding defects.
Shop practice & instructions
To minimize the LSIF, careful weld preparation is important. This includes proper cleaning of the weld surfaces, the use of suitable filler materials, and adherence to the correct welding parameters such as temperature and time. If a high LSIF is suspected, additional inspections should be carried out to identify possible cracks or stress concentrations.