Eutectic point
The eutectic point is the minimum melting point at which a liquid phase solidifies into two solid phases. It leads to a sharp transition near the melting point.
Physical-Chemical Mechanism of Action
The eutectic point is a specific point in a phase diagram where a liquid solution forms two different solid phases simultaneously at minimum temperature. This process occurs due to chemical composition and the degree of coupling between components.
Metallurgical Relevance & Welding Risks
During welding, the eutectic point can cause problems if the composition of the weld or base material is incorrect. This can lead to uneven deformations and stresses in the structure, resulting in cracks or fracture points. Additionally, a faulty eutectic point can affect the hardness and strength of the weld.
Workshop Practice & Action Guidelines
To avoid or properly manage the eutectic point, it is important to precisely control the composition of the weld material and base material. This can be ensured by selecting the right welding alloy and adhering to specific temperature and time conditions during welding. If necessary, metallurgical analyses should be performed to ensure the eutectic point is not reached.