Residual stress state
Residual stress state: Mechanical stresses that arise in a material and do not fully release when the material is loaded.
Physical-Chemical Mechanism of Action
Mechanical stresses occur when a material is unevenly loaded or thermally expanded. These stresses remain in the material and can change periodically over time.
Metallurgical Relevance & Risks in Welding
Residual stresses can lead to cracks and fractures, especially when the material is further stressed. During welding, the stress state can be intensified or new stresses can arise, affecting strength and hardness.
Workshop Practice & Instructions
Before welding a component, it should be checked for residual stresses. If stresses are apparent, measures such as mechanical stress relief or special welding procedures should be applied. Temperature control during welding is crucial to minimize stress buildup.