Abstract
Arc and electron beam welding can cause electromagnetic interference in nearby electronic equipment. The radiated power of a plasma arc 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 arc is calculated as a function of the plasma frequency, the frequencies contained in the plasma arc, the plasma collision frequency in the arc, and the dimensions of the beam and arc. With these results alone, the susceptibility of nearby electronic equipment from arc and electron beam welding can be determined. It is seen from the derivation of the arc-radiated power that adjustments and control of the plasma frequency and collision rate can reduce the possibilities of electromagnetic interference while still maintaining the welding performance.
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