Hollow tungsten electrode shunt based consumable electrode electric-arc welding device and method

Abstract

The invention belongs to the technical field of welding, and discloses a hollow tungsten electrode shunt based consumable electrode electric-arc welding device and method. The hollow tungsten electrode shunt based consumable electrode electric-arc welding device comprises a GMA welding power supply, a wire feeding mechanism, a shunt module, a controller, a current sensor, a workpiece, and a hollowtungsten electrode shunt consumable electrode welding gun, wherein the hollow tungsten electrode shunt consumable electrode welding gun comprises a welding wire, a conductive nozzle, a hollow tungsten electrode and a protective cover; one end of the welding wire is positioned in the wire feeding mechanism, and the other end of the welding wire is inserted into the conductive nozzle; the conductive nozzle is positioned in the hollow tungsten electrode; the upper half part of the conductive nozzle is a hollow cylinder; the lower half part of the conductive nozzle is a hollow cone; the hollow tungsten electrode is positioned in the protective cover; the upper half part of the hollow tungsten electrode is a hollow cylinder and the lower half part of the hollow tungsten electrode is a hollow cone; and the protective cover is in the shape of a cylindrical surface. The hollow tungsten electrode shunt based consumable electrode electric-arc welding device improves flexibility of the welding gun, guarantees consistency and reliability of welding quality, is convenient for all-position multi-direction welding, improves electric-arc stiffness and penetrability, and improves melting efficiency of filler wires.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a melting electrode arc welding device and method based on hollow tungsten electrode shunting. Background technique [0002] Gas metal arc welding (GMA) is one of the most widely used welding methods in industry due to its advantages of good flexibility, low cost and easy operation. However, in the traditional GMA welding process, the welding torch and the base metal are directly connected to the two poles of the welding power source, and the current flowing through the base metal is equal to the current of the melting wire, which makes the traditional GMA welding have certain disadvantages: (1) the welding wire The melting speed is directly related to the welding current. Efficient welding production requires a greater welding wire melting speed and a larger welding current, which will inevitably lead to an increase in welding heat input, expansion of the welding he...

AI Technical Summary

Problems solved by technology

However, in the traditional GMA welding process, the welding torch and the base metal are directly connected to the two poles of the welding power source, and the current flowing through the base metal is equal to the current of the melting wire, which makes the traditional GMA welding have certain disadvantages: (1) the welding wire The melting speed is directly related to the welding current. Efficient welding production requires a greater welding wire melting speed and a larger welding current, which will inevitably lead to an increase in welding heat input, expansion of the welding heat-affected zone, and increased post-weld deformation, resulting in joint quality Decrease, welding defects increase

(2) The form of droplet transfer has a certain relationship with the welding current. To obtain a stable droplet transfer, the welding current will inevitably increase and the welding heat input will increase.

①Mechanical compression effect - the arc passes through the water-cooled nozzle channel with a certain aperture, so that the arc section is restrained and cannot expand freely

However, in this method, the structure of the bypass welding torch and the main welding torch are separated, and the angle between the main welding wire and the bypass tungsten electrode is relatively large. On the one hand, the overall volume of the welding torch is increased, and the flexibility and accessibility of the welding torch are reduced. ; On the other hand, the main / bypass arc is distributed asymmetrically, and the directionality of welding is limited

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