Solvus line in phase diagrams
The solvus line shows the maximum solubility of a component in a solid phase at different temperatures. Below this line, secondary phases form.
Physical-Chemical Mechanism of Action
The solvus line in a phase diagram shows the maximum amount of a component that can be dissolved in a solid phase. This boundary line varies with temperature: the higher the temperature, the more component can be dissolved.
Metallurgical Relevance & Risks in Welding
Below the solvus line, phase differences can occur, leading to fine grain structures and altered material properties. This can impair the strength and toughness of the weld and increase cracking or wear.
Workshop Practice & Action Guidelines
To avoid phase differences, it is important that the welding temperature is above the solvus line. This can be ensured by careful selection of the welding process and materials. If needed, phase diagrams should be used to check composition and temperature.