Thermal ionization energy
Thermal ionization energy is the minimum energy required to split a gas atom into ions and free electrons. This happens through thermal excitation.
Physical-chemical mechanism of action
Thermal ionization energy describes the energy required to heat an atom in a gas state so strongly that it splits into ions and free electrons. This process occurs through thermal excitation, where the atom gains enough energy to break its electronic bonds.
Metallurgical relevance & risks in welding
In welding technology, thermal ionization energy is important for processes like plasma welding. Here, a gas is ionized by high temperature to create a hot, electric arc. If the ionization energy is too low, the plasma may be ineffective, and the welding process could fail. Too high energy can cause uncontrolled reactions and damage the workpiece.
Workshop practice & instructions
For practice, it is crucial to set the correct ionization energy for the gas state used. This can be achieved by adjusting voltage and current. A typical value for argon in plasma welding is about 15-20 kJ/mol. It is important to continuously monitor the ionization energy and adapt it to the specific conditions of the welding process.