Double heat source hybrid welding torch and welding method

Abstract

The invention provides a double heat source hybrid welding torch and a welding method. The double heat source hybrid welding torch comprises a consumable electrode and a non-consumable electrode, an acute angle is formed between respective axes of the electrodes, the acute angle is less than 60 degrees, an electric arc is built between the non-consumable electrode and a workpiece and between the consumable electrode and the workpiece, a common melting pool is formed, the distance between electric arc impact points of the two electric arcs on the plane of the workpiece is D, and stable state of the electric arcs is realized by virtue of an adjusting device used for adjusting the distance between the two electrodes and a magnetic shielding part used for applying a transverse magnetic field between the two electrodes. According to the double heat source hybrid welding torch, the influence of an electromagnetic force on the electric arcs can be reduced by virtue of the adjusting device according to parameter conditions of welding operation regardless of the direction and magnitude of an arc current, and the influence of an MIG (Metal-Inert Gas) electric arc on a plasma electric arc is practically reduced, wherein operation for adjusting the distance between the two electrodes by virtue of the adjusting device is more convenient, and effect is more direct.

Description

technical field [0001] The present invention relates to a welding device, in particular to a welding torch for composite welding of plasma arc (PAW) and melting electrode arc MIG (GMAW) dual heat sources, and a welding method using the composite welding torch. Background technique [0002] Welding techniques have been known for many years and are widely used in industrial applications. The MIG process of gas metal arc welding (GMAW) has a continuous, self-feeding melting electrode shielded from the ambient atmosphere by an external gas supply. Metal transitions from the molten electrode to the workpiece through the following three basic modes: (a) short-circuit transition, (b) particle transition, and (c) jet transition. Among them, the best working mode is the injection transition mode. The so-called MIG welding spray mode means that the metal enters the molten pool of the workpiece to be welded in a highly directional droplet flow from the melting electrode electrode. Th...

AI Technical Summary

Problems solved by technology

However, since the positions of the two electrode nozzles on the same welding torch are fixed, and this position interacts with the magnetic shield, it is difficult for this technology to work stably in a wide range of operating current parameters. In fact, adjusting the magnetic shield alone is not easy to stabilize the double arc in the communal molten pool, so it is difficult to popularize and apply it in the production line

[0010] As mentioned above, there is no doubt that compared with TIG arc, plasma arc is compressed, has higher energy density and welding penetration, and the use of plasma arc in hybrid welding process can increase welding penetration, which is very important for improving composite welding. Welding quality is very important; at the same time, the stability of plasma arc PAW and MIG arc in the communal molten pool is an important condition for achieving high-efficiency hybrid welding quality and efficiency, but the existing various plasma arc PAW and MIG arc hybrid welding It is difficult for the device to form or stabilize the common molten pool of the melting electrode and the non-melting electrode, so not only can not fundamentally improve the welding penetration and welding efficiency, but also it is difficult to achieve good welding quality, which limits the popularization and application of these technologies

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