Single-contact electric brush stable multi-arc common molten pool welding method

Abstract

The embodiment of the invention provides a single-contact electric brush stable multi-arc common molten pool welding method. Based on the method, a plurality of welding wires, a common contact electric brush and a plurality of welding power sources are involved, each welding power source is connected with one welding wire and the common contact electric brush to form a current loop, and the commoncontact electric brush is located under an electric arc of the first welding wire, and makes contact with the back surface of a welded workpiece; the welding wires are sequentially arranged in the welding direction, the first welding wire supplies power in a direct-current reverse connection mode, the other welding wires are electrified with the same-frequency alternating-current rectangular wavecurrent, alternating-current fundamental wave phases are alternately arranged according to 0 and pi, and the current amplitude is q times of the current amplitude of the previous welding wire; and the position of the wire end of each welding wire in the welding direction is determined according to the q value. According to the single-contact electric brush stable multi-arc common molten pool welding method, the optimal position of the contact electric brush, the optimal phase configuration of welding currents of the welding wires and the optimal wire end position distribution of the welding wires are provided on the basis of an electromagnetic simulation result, and are used for reducing the electromagnetic interaction among the electric arcs, improving the stability of the electric arcsand guaranteeing the welding quality.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a single-contact brush stable multi-arc eutectic pool welding method. Background technique [0002] The multi-arc eutectic pool welding technology is widely used in the welding of thick plates or thick-walled pipes due to its advantages of large current and high deposition efficiency. Due to the interference of force, the deflection and swing of the arc will affect the stability of the welding process and have an adverse effect on the welding quality control. On the other hand, the influence of process parameters such as the connection mode of the welding power supply and the workpiece to be welded, the amplitude of the welding current, the phase of the welding current, and the distribution of the distance between the welding wires to the electromagnetic force is coupled, and it is impossible to reduce the electromagnetic force interference by optimizing a single parameter. Sys...

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Problems solved by technology

[0005] The embodiment of the present invention provides a single-contact brush stable multi-arc eutectic pool welding method, which is used to solve the defect in the prior art that there is no solution for reducing electromagnetic force interference in the case of multi-wire eutectic pools, and realize multi-arc with stable arcs Eutectic pool welding method

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