Mathematical modeling of melting rate in twin-wire welding

The paper treats four mathematical models for calculation of melting rate in arc fusion welding with a wire in coil form. The mathematical models permit calculation of melting rate in direct current welding with single-wire and double-wire electrodes (both polarities). For single-wire welding the models treated have been improved with regard to the ones published in the literature, for twin-wire welding, these are the first models for calculation of melting rate. The mathematical models have already been tested in practice and the results obtained show that they are very accurate, simple and applicable to practice.