Weld Microstructure Entropy
The weld seam microstructure entropy measures the disorder and phase distribution in the solidified weld metal after the cooling process. It affects the toughness of the weld.
Physical-Chemical Mechanism of Action
Entropy is a measure of disorder in a system. In the context of weld metal, it describes the variety and arrangement of different phases (e.g., copper, nickel) after cooling. High entropy means greater disorder and more different phases.
Metallurgical Relevance & Risks in Welding
High weld metal microstructure entropy can lead to a coarser grain structure, reducing material toughness. This increases the risk of cracking and reduces the mechanical properties of the weld.
Workshop Practice & Action Guidelines
To achieve low entropy and thus good toughness, it is important to control the cooling process. This can be achieved by selecting the appropriate welding process (e.g., TIG welding for finer control) and proper cooling methods (e.g., shielded environment or special cooling paints).