Demixing Process
The segregation process is the process in which a homogeneous solution splits into two or more distinct chemical phases below their solubility limit. This leads to the formation of precipitates.
Physicochemical mechanism of action
A segregation process occurs when the concentration of a solution exceeds its solubility limit. The molecules of the dissolved substances separate and form different phases.
Metallurgical relevance & risks in welding
In welding, segregation can lead to precipitates that alter the microstructure. This can cause zinc spots or other undesirable structures in the material, which impairs strength and mechanical properties.
Workshop practice & instructions
To avoid segregation, it is important to precisely control the melting parameters (temperature, time). In certain steels or alloys, rapid cooling or a high carbon content can promote segregation. It is advisable to check the welding parameters in the manual for special materials and, if necessary, use special welding methods (e.g., MIG welding).