Multi-pass build-up sequence
The exact definition of the layer sequence in thicker cross-sections to achieve microstructural refinement through subsequent heat input.
When building up layers, you weld the seam in several layers on top of each other. Bring each layer on cleanly and don't let it get too hot, otherwise the structure will tip over. The heat from welding affects the previous layers – you have to keep that in mind if you want seam quality.
If you put too much heat in, you get stresses, distortion, and in the worst case cracks. Especially with higher-strength or higher-carbon steels, you have to be careful not to work too fast and not overheat the interpass layers. Don't let the seam cool down too quickly so the structure can settle.
In practice, that means: align each layer cleanly, don't overheat the previous layer, and dose the heat so that the seam is built up evenly. If you notice the seam getting too hot, take a break and let it cool down.