Three-Dimensional Heat Conduction in Weld Metal
Three-dimensional heat conduction describes how heat spreads in all directions and affects cooling. This is crucial for the solidification and structure of the weld metal.
Physico-chemical mechanism of action
Three-dimensional heat conduction means thermal energy spreads in all spatial directions. This leads to a uniform temperature distribution in the material and affects the cooling rate.
Metallurgical relevance & risks during welding
Uneven heat conduction can cause stress build-up, which can lead to cracks. Cooling too fast or too slow can affect the material structure and change its mechanical properties.
Workshop practice & instructions
To ensure optimal three-dimensional heat conduction, the preheat temperature should be strictly maintained. For thick parts, it is important that heat flows evenly in all directions. This can be achieved by sufficient heating duration and correct welding parameters.