МАГНІТНЕ ПОЛЕ ЗВАРЮВАЛЬНОГО СТРУМУ

Abstract

The use of one-sided high-speed welding is limited by a decrease in process stability, quality and welded joints toughness. The process stability determines the welds formation, the quality and welded joints toughness. Therefore, increasing process stability, quality and welded joints toughness is an important scientific and technical problem. The welding current magnetic field is created by the arc current and the current flowing through the liquid and base metal. The arc magnetic field creates a pinch-effect and compression under. the action of its own magnetic field, which concentrates energy and increases the electrode, the base metal melting and the welding process efficiency, reduces heat input and increases the welded joints toughness. The magnetic field of the current flowing through the liquid and base metal leads to magnetic blowing, which is the result of arc deflection according to the minimum energy law towards a lower magnetic field, process stability violation, lower quality and welded joints toughness. To regulate and use the welding current magnetic field, a method has been developed for measuring the magnetic field in the joint gap on the upper, lower surface and in the metal thickness middle when current flows through the plates and pipe, the adequacy of which is confirmed in the production conditions of pipe welding for gas and oil pipelines. The developed research technique provides of the welding current magnitude and magnetic field distribution the measurement in the junction gap of the plates and the pipe, which prevents the formation of undercuts and magnetic blowing during one-sided high-speed welding, increases the process stability, the quality and welded joints toughness.