Gas shielded arc welding method for improving electrical arc self-regulation performance and preventing welding stick from burning back

Abstract

The invention provides a gas shielded arc welding method for preventing welding wire burning back by enhancing electrical arc self adjusting property. The invention solves the problems in prior art of CO2 gas shielded welding machine which is not adaptable to the fluctuation of wire feed rate, which are welding gun shaking or dry elongation length variety, and unstable arc length during welding, week self adjusting ability of electric arc and burning back of the welding wires. During CO2 gas shielded arc welding process, in initial time when the electric arc voltage rises abnormally by inspecting variety of electric arc voltage, a feedback system of the welding electric source can adjust the output property of the electric welding machine automatically to inhibit increasing of arc length effectively, pause burning back of the welding wire, maintain the stability of the electric arc, prevent appearance of welding wire burning back and non-axial large drop phenomena, enhance self adjusting property of the electric arc with little length changing of electrical arc, maintain stable working of CO2 gas shielded arc welding system, and improve adaptability to destabilization of the welding machine remarkably. Thereby, when working at a same welding voltage, normal welding current range is enlarged, welding conditions are initiated more convenient than before, and an objective of facilitating stable working of CO2 gas shielded welding system is achieved.

Description

Technical field [0001] The invention relates to a gas shielded welding method and equipment, in particular to a gas shielded welding method for improving the self-regulating performance of an electric arc and preventing welding wire from burning back. Background technique [0002] Currently CO 2 The main disadvantage of the gas shielded welding machine is that when the wire feeding speed fluctuates, the welding torch shakes or the dry elongation changes, it will cause the arc length to be unstable, the arc self-adjustment performance is not strong, and the welding wire will burn back, and non-axial large drops Problems such as transition and arc breaking phenomenon. It seriously affects the stability of the arc and the process performance of gas shielded welding. In the welding power source of the traditional method, the arc voltage closed-loop control method is used to make the static external characteristics of the welding power source flat and hard, so as to improve the...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the existing CO 2 The gas-shielded welding machine cannot adapt to disturbances such as wire feeding speed fluctuations, torch jitter, or dry elongation changes. The arc length is unstable during the welding process, and the arc self-adjustment performance is not strong, resulting in welding wire burnback, non-axial large drop transition and arc break. etc., the present invention provides a gas shielded welding method for improving the self-adjustment performance of the arc and preventing the welding wire from burning back

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