Control of electromagnetic interference from arc and electron beamwelding by controlling the physical parameters in arc or electron beamtheoretical model

摘要

Arc and electron beam welding can cause electromagneticinterference in nearby electronic equipment. The radiated power of aplasma arc or electron beam from welding is derived in this researchfrom charge continuity and plasma momentum equations and treating thearcing plasma and electron beam as a radiating dipole. The net radiatedpower from the arc is calculated as a function of the plasma frequency,the frequencies contained in the plasma arc, the plasma collisionfrequency in the arc, and the dimensions of the beam and arc. With theseresults alone, the susceptibility of nearby electronic equipment fromarc and electron beam welding can be determined. It is seen from thederivation of the arc-radiated power that adjustments and control of theplasma frequency and collision rate can reduce the possibilities ofelectromagnetic interference while still maintaining the weldingperformance