Thermal dissociation
Thermal dissociation is the process where gas molecules break down into atoms or ions at high temperature. This releases additional binding energy and can lead to burns.
Physical-chemical mechanism of action
Thermal dissociation splits gas molecules into their basic components through extreme temperatures. This occurs because the energy of the molecules is high enough to break their bonds.
Metallurgical relevance & risks in welding
Thermal dissociation can lead to burns and unwanted chemical reactions in the welding direction. This can impair the quality of the weld and lead to cracks or deformation.
Workshop practice & instructions
To avoid thermal dissociation, temperatures must be strictly controlled for certain materials and processes. At high temperatures or with special gases, it is important to cool the welding process slowly and continuously to prevent unwanted chemical reactions.