Solidus line in phase diagrams
The solidus line in a phase diagram shows the temperature at which an alloy is fully solid. Below this line, the alloy remains liquid.
Physical-Chemical Mechanism of Action
The solidus line marks the point in a phase diagram where an alloy fully solidifies during progressive cooling. It separates the liquid phase from the solid phase.
Metallurgical Relevance & Risks in Welding
Below the solidus line, the alloy remains liquid, which can lead to incomplete cooling and possible phase transformations. This can lead to porosity and reduced mechanical properties of the weld.
Workshop Practice & Action Instructions
When welding, it is important to ensure that the alloy is cooled below the solidus line. This can be achieved through adequate cooling rate and the use of appropriate coolants. If cooling is improper, the weld may be incompletely solidified, leading to porosity and reduced mechanical properties.