Bypass shunt double-sided arc welding device and welding method

Abstract

The invention relates to a bypass shunt double-sided arc welding device and a welding method, which is characterized in that the device comprises a welding source, a main welding gun, an auxiliary welding gun, a bypass welding gun, an arc striker, a current sensor, a bypass resistor and a control system, etc. the main welding gun and the auxiliary welding gun are symmetrically arranged at both sides of a workpiece and are connected with two poles of the welding source; the bypass welding gun is argon tungsten-arc welding gun and is applied to one side of the main welding gun as a bypass to shunt partial welding current flowing through mother plates; therefore, the main welding gun can be connected with big current, reduce heat input acting on the mother plates while realizing high deposition efficiency and improve welding quality, while the auxiliary welding gun on the back of a molten pool is only connected with partial current, which is conductive to reducing electrode erosion and improving bearing capacity of the molten pool. As tungsten electrode electronic work function of the bypass welding gun is far lower than that of a metal workpiece, by the method, limit of welding wire shunt can be overcome and bypass current can be conveniently adjusted so as to ensure heat and force acting on the arc and molten pool are at ideal levels, therefore, the welding method is efficient and controllable.

Description

(1) Technical field [0001] The invention relates to a metal material welding device. The invention also relates to a welding method. (2) Background technology [0002] In the conventional arc welding process, the welding tongs are connected to one side of the workpiece, and the welding current mainly flows in the area close to the upper surface of the workpiece, which makes the current density diverge and easily produces magnetic deflection, which will directly affect the shape of the weld appearance and quality. Different from conventional arc welding, when single-power double-sided arc welding, the workpiece is not connected to the power supply, and two welding torches are connected to the two poles of the same welding power supply to form a circuit. In this way, the welding current flows directly through the welding area, and the current density and rigidity of the arc are improved, which is beneficial to the improvement of weld penetration and welding quality. However...

AI Technical Summary

Problems solved by technology

However, while the concentrated electromagnetic force increases the penetration depth, it also increases the disturbance of the molten pool, which makes the welding process difficult to control, and defects such as molten pool collapse and weld penetration often occur, which have become important factors restricting its production and application.

In order to solve this problem, the applicant filed an invention patent application with the patent application number of 200810137465.6, and proposed to use the filler wire to divert the welding current flowing through the workpiece. However, since the welding wire and the workpiece material are basically the same, they have the same electronic work function , the size of the cathode material becomes the decisive factor for electron emission, causing more electrons to be emitted from the weld pool, and a small amount of electrons come from the bypass wire, making the current through the bypass wire much lower than that of the base metal, which affects the effect of bypass shunting

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