Non-contact arc ignition method and device for mig welding assisted by tig arc

Abstract

The invention discloses a TIG arc assisted MIG welding noncontact arc ignition method and device. The method comprises the steps that TIG welding is started, and a TIG arc is ignited; and after the TIG arc is set up, MIG welding adopting direct current reverse polarity is started, after the non-load voltage of MIG welding is loaded, along with the situation that an MIG welding wire is fed towardsa workpiece or feeding of the MIG welding wire is not started yet, a discharge channel extends out of the tail end of the MIG welding wire and develops to a TIG arc area, and therefore a clearance between the tail end of the MIG welding wire and the TIG arc is broken down; and the MIG arc is subjected to noncontact ignition through the discharge channel. According to the method, arc ignition is fast and reliable, no welding splash is generated in the whole arc ignition process, and the arc ignition performance of MIG welding is ensured.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a TIG (Tungsten Inert Gas Welding, non-melting inert gas tungsten shielded welding) arc-assisted MIG welding (Metal Inert-Gas Welding, melting pole inert gas shielded welding) non-contact ignition Arc method and apparatus. Background technique [0002] Gas metal arc welding usually ignites the arc by contacting the welding wire with the workpiece, which is called contact arc ignition. Contact arc ignition is simple and easy, but it is easy to generate welding spatter during arc ignition, and in severe cases, welding wire will burst, especially when there is a residual ball with a large diameter at the end of the welding wire. When the welding wire breaks, if the end of the welding wire is far away from the workpiece, the arc ignition will fail, requiring two or more arc ignitions, resulting in poor arc ignition reliability. In addition, welding spatter will adhere to the inner...

AI Technical Summary

Problems solved by technology

However, in the initial arc ignition stage, due to the contact arc ignition, different degrees of welding spatter will always occur

When the welding part is a short weld or section welding is required, because the total welding time is relatively short or the number of arc strikes is relatively large, the influence of welding spatter generated in the arc strike stage on the quality of weld formation cannot be ignored and needs to be resolved

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