Longitudinal magnetic field influence on depth of fusion in arc welding of butt joints

Abstract

This paper investigates the influence of welding modes and longitudinal magnetic field on the butt joints, formation of welds of low carbon steel of 3...4 mm thickness. The influence of longitudinal magnetic field frequency on the depth of base metal penetration was studied. The investigations on welding joints of low carbon steel with4 mmthickness on the reverse polarity under the AN-348A flux were conducted. Welding of the fluxcopper lining of the C4 connection type was studied. It is shown that the depth of metal penetration increases with the increase of the longitudinal magnetic field frequency from 2 to 50 Hz. The values of the longitudinal magnetic field induction are 20...30 mT by 2...12 Hz frequency at magnetizing force of at least 2000 ampere-turns. The possibility of metal welding of3 mmthickness in a longitudinal magnetic field is shown. All these operations listed below are provided at longitudinal magnetic field with indicated parameters: formation of high-quality welds, complete penetration without burning-through metal, formation of the reverse bead which matches the requirements of GOST 8713-79 and absence of porosity in the welds. The research results can be applied to the welding of single-sided butt joints of 3...4 mm metal thickness.