Short-circuit transient welding method and system

Abstract

The invention relates to a short-circuit transient welding method and a system, which belong to the field of welding power supplies and welding automation equipment. According to the method, on the basis of a welding main current of a welding arcing stage, a high-frequency impulse is overlapped, so that the welding quality is improved by utilizing a high-frequency effect. At a short-circuit stage,a wire feed speed of a wire feeder is changed, so that wire feeding is slowed down; or a welding wire is withdrawn for assisting globular transfer. The invention additionally aims to provide the short-circuit transient welding system for implementing the welding method. The system adopts an alternate wire-feed method, meanwhile, a short-circuit state or an arcing state in a welding process can bedetected, and an appropriate welding current is output. In addition, at an arcing stage, a high-frequency impulse with the frequency being larger than 20kHZ can be overlapped. The researches show that by utilizing an electric arc with a high-frequency effect for welding, the welding stability and the electric arc stiffness can be greatly improved, and in addition, the high-frequency electric archas an effect on refining grains, so that weld microstructures and joint performances are favorably improved.

Description

technical field [0001] The present invention relates to a metal gas shielded welding method, which is implemented by changing the welding current and wire feeding speed during the welding process. The invention also relates to a welding system, which belongs to the field of welding power supply and welding automation equipment. Background technique [0002] Gas metal arc welding is a welding method with low cost, small deformation and easy realization. This welding method is widely used in the field of mechanical processing. In the welding process, there are various ways of droplet transfer, and the way of droplet transfer can usually be changed by changing the welding parameters. Commonly used transition methods include spray transfer, large drop transfer, short-circuit transfer, etc. Among them, the short-circuit transfer method is widely used in thin plate welding, because this transfer method is relatively stable in small current welding. In a short-circuit transition ...

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Problems solved by technology

[0004] The current control method of short-circuit transition welding is mainly to suppress the input of welding energy in the short-circuit stage, and does not make much improvement to the arc in the arc-burning stage.

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