Hot wire TIG welding gun with three tungsten electrodes

Abstract

The invention belongs to the field of automatic control of welding, mainly relates to a TIG welding gun, and discloses a hot wire TIG welding gun with three tungsten electrodes. The hot wire TIG welding gun aims to solve the problem that arc power of traditional TIG welding is limited due to the limited current loading capacity. The hot wire TIG welding gun comprises a hollow gun body, one side of the gun body is provided with a gun head, the other side of the gun body is provided with a gun tail, a conductive nozzle is arranged at the gun head, a wire feeding tube and the multiple tungsten electrodes are arranged in the gun body, one end of the wire feeding tube and one ends of the tungsten electrodes extend from the inner part of the gun body to the outside of the conductive nozzle, the central axis of the wire feeding tube is parallel to the central axes of the tungsten electrodes, and the tungsten electrodes are uniformly distributed in the circumferential direction of the wire feeding tube. According to the hot wire TIG welding gun, the technological problems such as arc blow and hot wire feeding position fluctuation generated during welding by a TIG welding device adopting external resistors to heat and preheat welding wires are effectively solved.

Description

technical field [0001] A TIG welding torch belongs to the field of welding automation control, and mainly relates to a three-tungsten hot wire TIG welding torch. Background technique [0002] Due to the limited current-carrying capacity of the electrode in traditional TIG welding, the arc power is limited to a certain extent, the weld depth is shallow, and the welding speed is small. In addition, in the existing hot wire TIG welding device, most of the welding wire is preheated by using an external resistor. The way of heating is to pass current on the welding wire, and use the resistance of the welding wire itself to generate heat to realize the preheating of the welding wire. There are several major technical problems in resistance heating hot wire TIG welding, namely magnetic deflection blowing, fluctuations in the feeding position of the hot wire, The oxidation of the welding wire before entering the molten pool is difficult to control and the ability to melt the base me...

AI Technical Summary

Problems solved by technology

[0002] Due to the limited current-carrying capacity of the electrode in traditional TIG welding, the arc power is limited to a certain extent, the weld depth is shallow, and the welding speed is small. In addition, in the existing hot wire TIG welding device, most of the welding wire is preheated by using an external resistor. The way of heating is to pass current on the welding wire, and use the resistance of the welding wire itself to generate heat to realize the preheating of the welding wire. There are several major technical problems in resistance heating hot wire TIG welding, namely magnetic deflection blowing, fluctuations in the feeding position of the hot wire, The oxidation of the welding wire before entering the molten pool is difficult to control and the ability to melt the base metal is limited, which is not conducive to the accurate positioning of the arc and is difficult to apply to the welding of high-conductivity materials such as copper and aluminum, and the oxidation of the welding wire before entering the molten pool is very difficult. Difficult to control. At present, copper and aluminum alloys are widely used in important fields such as aviation, national defense, and nuclear power.

The traditional wire feeding method is manual wire feeding or adding an auxiliary wire feeding gun to the end of the welding torch, both of which are wire feeding from the outside. The energy of the arc is exposed to the outside of the nozzle, and the arc energy has a certain loss before it contacts.

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