Welding machine with wire feeding and wire drawing being conducted alternately and power supply control method thereof

Abstract

The invention discloses a welding machine with wire feeding and wire drawing being conducted alternately and a power supply control method thereof, and belongs to the field of welding machine control systems. The problems that as for an existing gas-shielded electric welding machine, sheets cannot be welded easily and splashing is serious are solved. The power supply control method of the welding machine includes an arcing stage, a short-circuit stage and a drawing stage. At the arcing stage, a constant voltage control mode or a constant current control mode is adopted, and welding wires are fed in at a constant speed. At the short-circuit stage, the welding wires make contact with workpieces, the constant current control mode is adopted, and wire feeding is stopped. At the drawing stage, the constant current control mode or the constant voltage control mode is adopted for controlling the heating amplitude of the workpieces, and the welding wires are drawn at a constant speed. The welding wires are reset to the arcing stage after the drawing stage is completed. According to the welding machine with wire feeding and wire drawing being conducted alternately and the power supply control method thereof, different control mode circuits are used in different welding stages, and a wire feeder rotates forwardly or reversely in an associated mode for wire feeding or wire drawing, so that the effects of reducing arc heat, being capable of welding the sheets and reducing splashing are achieved.

Description

technical field [0001] The invention belongs to the field of welding machine control systems, and relates to a control method for reducing spatter and heat in MAG / MIG / CO2 gas shielded welding, in particular to a welding machine with alternate wire feeding and wire drawing and its power source control method. Background technique [0002] At present, the circuit of electric welding machine is as follows: figure 1 shown. In the figure, IN is the fixed circuit of the welding machine, which can be a potentiometer or a module with complex circuits. In the figure, CM is the control mode circuit, and the control mode circuit basically has two modes: CC mode (constant Current mode) and CV mode (constant voltage mode); PWM, P in the figure are pulse width modulators and inverters, common ones are 3523, 3846, 3875, etc., half-bridge inverters, full-bridge inverters, etc. The reason why there are different types of electric welding machines mainly depends on different types of CM. Fo...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of difficulty in welding thin plates and serious spatter of existing gas-shielded electric welding machines, the present invention provides an electric welding machine and a control method that can alternately change control modes. In the whole welding process, different control modes are adopted at different stages of welding The circuit makes the wire feeder rotate forward or reverse in association to feed or draw wire, which can reduce the heat of the arc, can weld thin plates, and reduce spatter

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