Electron work function
The electron work function is the energy required to remove an electron from the surface of a material and bring it into the plasma space. It affects the anode performance and welding behavior.
Physicochemical mechanism of action
The electron work function (EWF) is the energy required to remove an electron from the surface of a material and bring it into the plasma space. This process depends on the material structure and binding energies.
Metallurgical relevance & risks in welding
A high EWF can reduce anode performance, as more energy is needed to release electrons. This results in lower current density and a slower welding process. Too low an EWF can lead to irregular plasma melting and poor weld results.
Shop practice & instructions
To ensure optimal anode performance, the EWF of the material used should be precisely known. When selecting a material for the electrode, it is important that its EWF matches the requirements of the welding process. If there are issues with current density or plasma melting, checking and adjusting the EWF may help.