Structural inhomogeneity
Structural inhomogeneity is local differences in composition, grain size, or phase distribution within a metal. These cause nonuniform mechanical properties and increase the risk of material failure.
Physico-chemical mechanism of action
Structural inhomogeneities arise from local variations in composition, grain size, or phase distribution within a metallic microstructure. These deviations can occur during melting, cooling, or deformation processes and lead to uneven mechanical properties.
Metallurgical relevance & welding risks
Structural inhomogeneities can be starting points for material failure because they cause different stress states and thus lead to cracks or destruction. In the weld, this can result from uneven cooling or incomplete deformation.
Workshop practice & action guidelines
To minimize structural inhomogeneities, ensure even melting and cooling practices. Keep the weld as short as possible and avoid excessively long cooling times. For complex parts, it can be helpful to preheat or normalize the workpiece before welding.