Bainitic microstructure

Intermediate structure forms when the steel cools after welding in such a way that neither martensite nor pearlite is formed. The result is a tough, well-stressable structure that is suitable for many parts. In practice, this means: you have to control the cooling after welding. Don't let it cool too fast, otherwise it becomes hard and crack-sensitive. But not too slow either, otherwise the structure becomes too soft. The correct cooling rate depends on the steel, so stick to the specifications for the respective material.