Equilibrium concentration
The equilibrium concentration is the chemical proportion of a substance in a phase at which no further chemical reactions occur. It is read from phase boundaries.
Physical-Chemical Mechanism of Action
The equilibrium concentration describes the state where the concentration of a substance in a phase is such that no further chemical reactions occur. This state is achieved by the exchange of particles between phases until the chemical potentials are equal.
Metallurgical Relevance & Risks in Welding
In welding, the equilibrium concentration is crucial for avoiding porosity and hot cracking. Too high a concentration of certain chemical elements can alter the microstructure, leading to loss of toughness or crack susceptibility.
Workshop Practice & Instructions
To ensure the equilibrium concentration, welding parameters such as temperature and pressure must be precisely controlled. For certain steels or alloys, it is important that the melting process is slow and controlled to achieve a homogeneous structure and a stable chemical composition.