The Voltage Drop in the Welder Throat Loaded With Ferromanetic Materials

The magnetic flux distribution in a welder throat, containing two steel sheets, is calculated as a potential field. On this basis, the flux density in the sheets and the flux change caused by their presence in the throat are computed, and furnish the voltage drop caused by the sheets if they would be unsaturated. Actually, the sheets are saturated, and this condition is considered by approximating the magnetization curve of the welding material with a broken line. The corresponding voltage components are calculated for various dimensions of the throat and of the sheets, for different positions of the sheets in the throat, and for different welding currents, and agree satisfactorily with test results.