Control of electromagnetic interference from arc and electron beam welding by controlling the physical parameters in the arc or electron beam: Theoretical model

Are and electron beam welding can cause electromagnetic interference in nearby electronic equipment. The radiated power of a plasma are or electron beam from welding is derived in this research from charge continuity and plasma momentum equations and treating the arcing plasma and electron beam as a radiating dipole. The net radiated power from the are is calculated as a function of plasma frequency, the frequencies contained in the plasma are, the plasma collision frequency in the are, and the dimensions of the beam and are. With these results alone, the susceptibility of nearby electronic equipment from are and electron beam welding can be determined. It will be seen from the derivation of the are-radiated power that adjustments and control of the plasma frequency and collision rate can reduce the possibilities of electromagnetic interference while still maintaining welding performance.