WO2018036122A1

WO2018036122A1 - Coaxial hollow tungsten electrode hot wire tig welding gun, welding device, and welding method

Info

Publication number: WO2018036122A1
Application number: PCT/CN2017/074516
Authority: WO
Inventors: 姚君山
Original assignee: 江苏阿斯美特精工科技有限公司
Priority date: 2016-08-24
Filing date: 2017-02-23
Publication date: 2018-03-01
Also published as: CN106141387A

Abstract

A coaxial hollow tungsten electrode hot wire TIG welding gun. The welding gun comprises a gun body (1) and a tungsten electrode (2); the gun body (1) is hollow; one end of the gun body (1) is provided with a nozzle (11); the tungsten electrode (2) is axially and fixedly provided in the center of the gun body (1), and one end part of the tungsten electrode (2) penetrates out of the nozzle (11); the tungsten electrode (2) is hollow, and one end part of the tungsten electrode (2) is provided with a welding wire hole (21) that allows a welding wire (5) to pass through. Also disclosed are a welding device and a welding method. Before entering a welding pool, a welding wire has been preheated and subjected to gas protection, such that a preheating effect is greatly improved, oxidation of the heated welding wire is avoided, energy for welding wire arc melting is reduced, and the deposition efficiency, the welding speed, and the quality of welded seams are improved.

Description

Coaxial hollow tungsten hot wire TIG welding torch, welding device and welding method

Technical field

The invention relates to the technical field of hot wire TIG welding, in particular to a coaxial hollow tungsten hot wire TIG welding torch, a welding device and a welding method.

Background technique

The existing hot wire TIG welding is a high quality, high efficiency and energy saving TIG welding method. It is based on ordinary TIG welding, preheating the welding wire before the welding wire is fed into the molten pool to increase the heat input, increase the melting speed of the welding wire and the base metal, increase the welding speed and welding speed, and realize high-speed and high-efficiency welding. And retain all the advantages of TIG welding such as arc stabilization and excellent weld bead performance; suitable for welding medium thickness welded structures.

In the existing hot wire TIG welding, the resistance heating method is used to preheat the welding wire, that is, before the welding wire is sent into the molten pool, a certain current is passed on the welding wire, and the welding wire is used to heat the wire to realize the preheating of the welding wire, but the preheating thereof The magnetic partial blow generated during the thermal process adversely affects the shape of the weld and the precise positioning of the arc. Moreover, this process is suitable for welding materials with high electrical resistivity such as carbon steel and stainless steel, but it is difficult to apply to the welding of high conductivity materials such as copper and aluminum. At present, copper alloys and aluminum alloys are widely used in the fields of national defense and nuclear power. The hot wire TIG welding technology suitable for copper alloys and aluminum alloys must be further improved in terms of welding efficiency, preheating effect and weld quality.

Summary of the invention

The present invention aims to solve the above problems, and provides a coaxial hollow tungsten hot wire TIG welding torch, a welding device and a welding method, which are specifically realized by the following technical solutions:

The coaxial hollow tungsten hot wire TIG welding gun comprises a gun body and a tungsten pole, wherein the gun body is hollow, and one end of the gun body is provided with a nozzle, and the tungsten pole is fixedly disposed in the middle of the gun body and the end portion thereof is worn. The nozzle is formed; the tungsten electrode is hollow, and its end portion has a wire hole through which the wire passes.

The coaxial hollow tungsten hot wire TIG welding torch is further designed to form a first protective cavity in the inner space of the tungsten pole, and a second protective cavity is formed between the outer wall of the tungsten pole and the inner wall of the gun; The first protection chamber and the second protection chamber communicate with the inert shielding gas source through the channel.

The coaxial hollow tungsten hot wire TIG welding torch is further designed to: the gun body sidewall is provided with an air inlet hole communicating with the inert shielding gas source; the tungsten electrode sidewall is provided with communication a communication hole of the first protection cavity and the second protection cavity.

a coaxial hollow tungsten hot wire TIG welding device comprising a welding gun, a wire feeding mechanism and an inert protective gas source, the welding gun comprising a gun body and a tungsten pole, the gun body being hollow, and one end of the gun body is provided with a nozzle, a tungsten pole is axially fixedly disposed in a middle portion of the gun body and has an end portion penetrating the nozzle; the tungsten electrode is hollow and has an end portion having a wire hole through which the welding wire passes; the wire feeding mechanism includes a driving wheel And a wire spool having a wire wound, the wire on the wire spool being conveyed into the tungsten electrode via the driving wheel set, and an end of the wire passing through an end of the tungsten electrode; the inert shielding gas The gas source communicates with the inside of the gun body and the inside of the tungsten electrode through a pipe.

The coaxial hollow tungsten hot wire TIG welding device is further designed to: the driving wheel set comprises two driving wheels rotatably disposed between the welding torch and the wire spool, and two driving wheels Symmetrically disposed, the rotation of the two is reversed, and the gap between the edges between the drive wheels is equal to the diameter of the wire so that the wire is clamped between the drive wheels and is rotated with the drive wheel It is delivered into the tungsten electrode.

Coaxial hollow tungsten hot wire TIG welding method, the welding method adopts a coaxial hollow tungsten hot wire TIG welding gun, the welding gun includes a gun body and a tungsten pole, the gun body is hollow, and one end of the gun body is provided with a nozzle, The tungsten electrode is axially fixedly disposed in a middle portion of the gun body and has an end portion penetrating the nozzle; the tungsten electrode has a hollow shape, and an end portion thereof has a wire hole through which the welding wire passes.

The coaxial hollow tungsten hot wire TIG welding method is further designed to include the steps of: placing the welding torch on one side of a workpiece to be welded, and the nozzle and the tungsten electrode are opposite to the joint to be welded; The wire mechanism enters the inner cavity of the tungsten pole, and the end of the welding wire passes through the wire hole; the inert protective gas is simultaneously supplied into the inside of the gun body and the inside of the tungsten electrode, and then the welding power source is connected to the welding seam of the tungsten electrode and the workpiece During the arcing, a weld pool is formed at the weld seam, and the inert protective gas sprayed from the nozzle covers the molten pool to form gas protection for the molten pool, and the temperature of the tungsten electrode begins to rise; the wire feeding mechanism continues to feed into the tungsten electrode. The welding wire enters the tungsten wire and receives the tungsten heat radiation. The arc heat is preheated before entering the molten pool. The wire preheated by the tungsten electrode enters the molten pool for subsequent welding.

The invention has the beneficial effects that the conventional solid tungsten electrode is improved into a hollow tungsten pole, and the welding wire conveyed by the conventional external automatic wire feeding device is passed through the hollow tungsten electrode for wire feeding, and the conventional gas supply device is used. The inert shielding gas is input from the air inlet hole of the welding gun body, and enters the hollow tungsten electrode through the corresponding communication hole on the hollow tungsten electrode; thereby realizing automatic wire feeding and preheating and gas protection before the welding wire enters the molten pool , greatly improving the preheating effect and avoiding the oxidation of the heated wire, reducing the energy of the arc melting wire, improving the deposition efficiency, welding speed, reducing the generation of pores such as H, improving the quality of the weld; and according to different arc output Power, the available hot wire temperature range is much wider than the traditional hot wire; the invention is suitable for welding in various joint forms, can realize fully automatic operation, and can freely move and easily change the site, saving cost and space, achieving more Functional, user-friendly design.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the structure of an embodiment of a welding torch of the present invention.

2 is a schematic view showing the structure of an embodiment of a welding apparatus of the present invention.

detailed description

The present invention is further described below in conjunction with the drawings and embodiments of the specification:

Embodiment 1, as shown in FIG. 1, the coaxial hollow tungsten hot wire TIG welding torch comprises a gun body 1 and a tungsten pole 2, the gun body 1 is hollow, and one end of the gun body is provided with a nozzle 11 and the tungsten pole 2 is axially It is fixedly disposed in the middle of the gun body and has its end penetrating out of the nozzle 11; the tungsten electrode 2 is hollow, and its end portion has a wire hole 21 through which the welding wire 5 passes.

The inner space of the tungsten pole 2 forms a first protection cavity 22, and a second protection cavity 12 is formed between the outer wall of the tungsten electrode and the inner wall of the gun body 1. The first protection cavity 22 and the second protection cavity 12 communicate with the inert shielding gas source through the channel.

The side wall of the gun body 1 is provided with an air inlet hole 13 communicating with a source of inert protective gas; the side wall of the tungsten electrode 2 is provided with a communication hole 23 communicating with the first protection chamber and the second protection chamber.

Embodiment 2, as shown in FIG. 1 and FIG. 2, a coaxial hollow tungsten hot wire TIG welding device includes a welding torch 3, a wire feeding mechanism 4 and an inert shielding gas source, and the welding torch 3 includes a gun body 1 and a tungsten electrode 2, The gun body 1 is hollow, and one end of the gun body is provided with a nozzle 11 which is fixedly disposed in the middle of the gun body 1 in the axial direction and whose end portion passes through the nozzle 11; the tungsten electrode 2 has a hollow shape, and the end portion thereof has a a wire hole 21 through which the wire passes; the wire feeding mechanism 4 includes a driving wheel set 41 and a wire reel 42 wound with a wire, the wire on the wire reel is conveyed into the tungsten electrode via the driving wheel set, and the end of the welding wire passes through the tungsten The end of the pole; the inert protective gas source communicates with the interior of the gun body and the interior of the tungsten pole through the pipeline.

The driving wheel set 41 comprises two driving wheels 411 rotatably disposed between the welding gun and the welding wire disc, and the two driving wheels are symmetrically arranged, the rotation of the two is reversed oppositely, and the gap between the driving wheels and the welding wire The diameters are equal such that the wire is clamped between the drive wheels and fed into the tungsten pole as the drive wheel rotates.

Embodiment 3, as can be seen from FIG. 2, the coaxial hollow tungsten hot wire TIG welding method adopts the aforementioned coaxial hollow tungsten hot wire TIG welding gun, the welding gun includes a gun body and a tungsten pole, and the gun body is hollow and the gun body One end is provided with a nozzle, the tungsten pole is fixedly disposed in the middle of the gun body in the axial direction and the end portion thereof passes through the nozzle; the tungsten electrode is hollow, and the end portion has a wire hole through which the welding wire passes.

The welding method specifically comprises the steps of: placing the welding torch on one side of the workpiece to be welded, and the nozzle and the tungsten electrode are opposite to the joint to be welded; the welding wire enters the inner cavity of the tungsten electrode through the wire feeding mechanism, and the end of the welding wire is self-owned The wire hole is pierced; an inert shielding gas is simultaneously supplied into the inside of the gun body and inside the tungsten electrode, and then the welding power source is turned on to arc between the tungsten electrode and the welding seam of the workpiece, and a weld pool is formed at the weld seam, and is ejected from the nozzle. The inert protective gas covers the molten pool to form gas protection for the molten pool, and the temperature of the tungsten electrode begins to rise; the wire feeding mechanism continuously feeds the welding wire into the tungsten electrode, and the wire entering the tungsten electrode receives the tungsten heat radiation and electricity. The arc heat is preheated before entering the molten pool, and the wire preheated by the tungsten electrode enters the molten pool for subsequent welding.

Claims

a coaxial hollow tungsten hot wire TIG welding gun, comprising: a gun body and a tungsten pole, wherein the gun body is hollow, and one end of the gun body is provided with a nozzle, and the tungsten pole is fixedly disposed in the middle of the gun body in the axial direction and The end portion passes through the nozzle; the tungsten electrode is hollow and has an end portion having a wire hole through which the wire passes.
The coaxial hollow tungsten hot wire TIG welding torch according to claim 1, wherein the tungsten inner space forms a first protection cavity, and the tungsten outer wall forms a second protection between the inner wall of the gun and the inner wall of the gun. a cavity; the first protection cavity and the second protection cavity are in communication with the inert shielding gas source through the channel.
The coaxial hollow tungsten hot wire TIG welding torch according to claim 2, wherein the gun body side wall is provided with an air inlet hole communicating with the inert shielding gas source; and the tungsten electrode side wall A communication hole connecting the first protection chamber and the second protection chamber is disposed.
The coaxial hollow tungsten hot wire TIG welding device is characterized by comprising a welding gun, a wire feeding mechanism and an inert protective gas source, the welding gun comprises a gun body and a tungsten pole, the gun body is hollow, and one end of the gun body is provided with a nozzle The tungsten electrode is fixedly disposed in the middle of the gun body in the axial direction and has its end penetrating out of the nozzle; the tungsten electrode is hollow, and the end portion has a wire hole through which the welding wire passes; the wire feeding mechanism A drive wheel set and a wire spool wound with a wire, the wire on the wire spool being conveyed into the tungsten pole via the drive wheel set, and an end of the wire passing through an end of the tungsten pole; An inert protective gas source communicates with the interior of the gun body and the interior of the tungsten electrode through a conduit.
The coaxial hollow tungsten hot wire TIG welding apparatus according to claim 4, wherein the driving wheel set comprises two driving wheels rotatably disposed between the welding torch and the wire reel, and two The driving wheels are symmetrically arranged, the rotation of the two is reversed, and the gap between the edges between the driving wheels is equal to the diameter of the welding wire, so that the welding wire is clamped between the driving wheels and with the driving wheel The rotation is fed into the tungsten pole.
A coaxial hollow tungsten hot wire TIG welding method, characterized in that the welding method adopts a coaxial hollow tungsten hot wire TIG welding gun, the welding gun includes a gun body and a tungsten pole, the gun body is hollow, and one end of the gun body A nozzle is provided, the tungsten electrode is axially fixedly disposed in a middle portion of the gun body and has an end portion penetrating the nozzle; the tungsten electrode is hollow and has an end portion having a wire hole through which the wire passes.
The coaxial hollow tungsten hot wire TIG welding method according to claim 6, comprising the steps of: placing the welding torch on one side of the workpiece to be welded, and the nozzle and the tungsten electrode are opposite to the joint to be welded; The welding wire enters the inner cavity of the tungsten electrode through the wire feeding mechanism, and the end of the welding wire passes through the wire hole; the inert protective gas is simultaneously supplied into the inside of the gun body and the inside of the tungsten electrode, and then the welding power source is turned on in the tungsten electrode and the workpiece The arc is welded between the welded joints, and the weld pool forms a molten pool. The inert protective gas sprayed from the nozzle covers the molten pool to form gas protection for the molten pool, and the temperature of the tungsten electrode begins to rise; the wire feeding mechanism continues The welding wire is fed into the tungsten electrode, and the wire entering the tungsten electrode receives the tungsten heat radiation, and the arc heat is preheated before entering the molten pool, and the wire preheated by the tungsten electrode enters the molten pool for subsequent welding.