Peritectic Solidification Reaction

Complex phase transition where residual liquid and an already solidified phase react at constant temperature to form a new solid phase, often associated with diffusion limitations.

Peritectic reactions are usually not a big deal when welding normal structural steels. They occur more with certain alloys where melt and already formed crystal react with each other. If the structure doesn't react completely cleanly, it can lead to segregation and in the worst case to cracks. In practice, this means: keep cooling in the critical range uniform and not too rapid. If you prepare the joint cleanly and control the heat input, nothing dramatic usually happens. For critical materials, it helps to monitor the interpass temperature and not get too hot.

MetallurgieSchweißtechnik