Yield Strength Determination
Yield strength is the point where a material transitions from elastic to plastic deformation. It gives the maximum stress up to which the material is permanently deformed.
Physicochemical Mechanism of Action
The yield strength is the maximum stress up to which a material can be deformed without permanent deformation. Above this limit, the material starts to yield and retains the deformation after unloading.
Metallurgical Relevance & Welding Risks
When the yield strength is exceeded, permanent deformations occur in the material. This can lead to cracks, breakage, or reduced service life. In a weld, this can also lead to uneven stress distribution and hence further mechanical issues.
Workshop Practice & Action Guidelines
To determine the yield strength, a tensile test is performed. The maximum stress until the material yields is recorded. When welding, it is important that stresses remain below this limit to ensure a safe and stable joint.