Weld Metal Solidification Model
The weld metal solidification model describes the growth of dendrites and the grain structure during cooling of the liquid weld pool. It helps minimize texture-related weak points in the joint.
Physical-Chemical Mechanism of Action
The weld metal solidification model describes the growth of dendrites and the grain structure during cooling of the liquid weld pool. During solidification, crystals (dendrites) grow from the liquid metal, which affects the grain structure.
Metallurgical Relevance & Risks in Welding
Uneven dendrite growth can lead to texture-related weak points, such as cracks or fractures. A finer grain structure increases the strength and toughness of the weld metal.
Workshop Practice & Action Guidelines
To achieve an optimal grain structure, the cooling rate should be controlled. This can be done by selecting the appropriate welding method and parameters. For steels with high carbon content, slow cooling (t8/5 > 25 s) is recommended to avoid glassy grains.