CN107186322B - Half-split hollow tungsten electrode coaxial wire feeding inert gas shielded welding gun - Google Patents

Abstract

A semi-split hollow tungsten coaxial wire-feeding inert gas shielded welding torch, which includes a copper shielding gas nozzle, a copper shielding gas chamber and a copper shielding gas nozzle cooling ring; the invention achieves good quality and MIG welding efficiency in traditional TIG High advantages in two aspects; the hollow tungsten electrode adopts two half-split hollow tungsten electrodes, the manufacturing process is simple, and the application is convenient; in addition, the core of the half-split hollow tungsten electrode has a ceramic tube or the inner surface of the hollow tungsten electrode is coated with insulating ceramics. Layer, the ceramic tube or insulating ceramic coating effectively prevents the contact conduction between the welding wire and the tungsten electrode and the tungsten copper cooling body.

Description

Half-split hollow tungsten electrode coaxial wire feeding inert gas shielded welding torch

technical field

The invention belongs to the field of welding, cladding and additive manufacturing, and specifically refers to a half-split hollow tungsten pole coaxial wire feeding inert gas shielded welding torch.

Background technique

The traditional MIGA welding uses the arc between the meltable welding wire and the workpiece to be welded as the heat source to melt the welding wire and the base metal, and transports the shielding gas to the welding area to make the arc melt the welding wire, the molten pool and the surrounding base metal. The base metal is protected from the harmful effects of the surrounding air. A welding method in which the continuously fed wire metal continuously melts and transitions to the molten pool, where it fuses with the molten parent metal to form a weld metal, thereby connecting the workpieces to each other. Traditional non-coaxial wire feeding TIG welding, although the welding quality is relatively good, but in automatic welding, cladding and additive manufacturing of complex paths, due to the change of welding direction, the positional relationship between the welding wire and the arc is affected, so it affects Stable welding quality. Although some people have applied for coaxial wire-feeding hollow tungsten electrode TIG welding method (such as patent CN201620935656.7, patent CN201610718425.5, patent CN201610998677.8, patent CN201611030406.X), but the hollow tungsten electrode is composed of one body, which is difficult for manufacturing posed some difficulties. In addition, the patented hollow tungsten electrode has no core ceramic tube and no insulating ceramic coating on the inner surface.

Contents of the invention

Purpose of the invention:

The invention provides a half-split hollow tungsten pole coaxial wire-feeding inert gas shielded welding torch, which aims to solve the existing problems in the past. The invention adopts the water-cooling channel system of the tungsten copper cooling body, which greatly improves the current-carrying capacity of the tungsten electrode, thereby improving the production efficiency; in addition, the copper shielding gas nozzle has a water-cooling channel, which ensures the service life of the copper shielding gas nozzle. It also ensures the stability of welding performance.

Technical solutions:

A half-split hollow tungsten coaxial wire-feeding inert gas shielded welding torch is characterized in that the welding torch includes a copper shielding gas nozzle, a copper shielding gas chamber and a copper shielding gas nozzle cooling ring; the copper shielding gas nozzle cooling ring is set on The periphery of the copper protective gas nozzle, the copper protective gas cavity is fixed with the bracket, and the front of the copper protective gas cavity forms a forward and gradually inward copper protective gas nozzle. In the copper protective gas cavity, a tungsten pole copper cooling body, tungsten pole A gas channel is formed between the copper cooling body and the inner wall of the copper protective gas chamber, and the gas channel is connected with the copper protective gas nozzle. The tungsten electrode copper cooling body is equipped with a half-split hollow tungsten electrode, and the half-split hollow tungsten electrode extends out of the tungsten electrode for copper cooling. When in use, the welding wire passes through the bracket, tungsten copper cooling body and half-split hollow tungsten electrode, and merges with the shielding gas sprayed from the copper shielding gas nozzle.

A cooling water channel is arranged in the tungsten copper cooling body, and the cooling water channel forms a water inlet at the bracket.

A ceramic insulating layer or a ceramic insulating tube is arranged between the half-split hollow tungsten electrode and the welding wire, and the rear end of the ceramic insulating layer or ceramic insulating tube passes through the half-split hollow tungsten electrode and then extends into the copper tungsten cooling body and is cooled by water Channel surround.

The tip of the half-split hollow tungsten electrode is pointed and spherical to produce a circular arc.

The welding wire is first introduced into the alloy tube by the wire feeding mechanism, and then enters the interior of the ceramic tube.

The half-split hollow tungsten electrode is a complete hollow tungsten electrode formed by bonding two half-split hollow tungsten electrodes.

The ceramic insulating layer is manufactured on the inner surface of the tungsten electrode by spraying.

The gas passage forms air inlets at the bracket, and the air inlets are symmetrically distributed.

There are 2 sets of locking bolts on the tungsten copper cooling body to fix the half-cracked hollow tungsten pole and its core, ceramic insulating layer or ceramic insulating tube.

The welding wire is introduced into the interior of the ceramic tube by the wire feeding mechanism, and comes out from the tip of the half-cracked hollow tungsten electrode.

Advantages and effects:

The invention provides a semi-split hollow tungsten pole coaxial wire-feeding inert gas shielded welding torch. The hollow tungsten pole adopts the half-split hollow tungsten pole method, which has simple manufacturing process and convenient application; moreover, a tungsten pole red copper cooling body is added. Water-cooling channel and copper shielding gas nozzle The water-cooling channel can greatly improve the current-carrying capacity of the tungsten electrode and the service life of the copper shielding gas nozzle, ensuring that the welding efficiency is improved and the welding quality is stable.

The coaxial wire-feeding tungsten inert gas shielded welding torch device is further designed in that the core of the half-split hollow tungsten pole has a ceramic tube or the inner surface of the hollow tungsten pole has an insulating ceramic coating, and the ceramic tube or insulating ceramic The function of the coating is to prevent the contact conduction between the welding wire and the tungsten electrode and the tungsten copper cooling body.

The coaxial wire feeding tungsten inert gas shielded welding torch device is further designed in that the welding wire is introduced into the interior of the ceramic tube by the wire feeding mechanism and comes out from the tip of the half-split hollow tungsten electrode.

The beneficial effects of the present invention are specifically as follows:

1. The invention realizes the advantages of good quality of traditional TIG and high efficiency of MIG welding;

2. The hollow tungsten pole adopts two half-split hollow tungsten poles, the manufacturing process is simple and the application is convenient; in addition, there is a ceramic tube at the core of the half-split hollow tungsten pole or the inner surface of the hollow tungsten pole is coated with insulating ceramics. The tube or insulating ceramic coating effectively prevents the contact conduction between the welding wire and the tungsten electrode and the tungsten copper cooling body.

3. The welding torch head adopts a water-cooled structure, which improves the ability to carry welding current, thereby greatly improving production efficiency;

4. The hollow tungsten electrode adopts the half-split type (combined by two semi-hollow tungsten electrodes) manufacturing method, which can be sprayed on the inner surface of the tungsten electrode, while the integral type cannot process the inside of the hollow tungsten electrode processing, and the manufacture of semi-hollow tungsten electrodes is simpler, and the accuracy of concentricity is higher;

5. The core of the half-split hollow tungsten pole adopts a ceramic tube or the inner surface is sprayed with an insulating ceramic coating, which prevents the contact and conduction between the welding wire and the tungsten pole, but the integral hollow tungsten pole cannot solve this problem.

Description of drawings:

Fig. 1 is a structural schematic diagram of a half-split hollow tungsten pole coaxial wire feeding inert gas shielded welding torch;

Figure 2 Sectional view of the water cooling channel of the tungsten copper cooling body;

Fig. 3 is a top view of a half-split hollow tungsten pole coaxial wire feeding inert gas shielded welding torch;

Figure 4-1 is a schematic diagram of a form of half-split hollow tungsten pole face;

Figure 4-2 is a schematic diagram of the second form of the half-split hollow tungsten pole face;

Figure 4-3 is a schematic diagram of the third form of the half-split hollow tungsten pole face;

Figure 4-4 is a schematic diagram of the fourth form of the half-split hollow tungsten pole face;

Figure 4-5 is a bottom view of Figure 4-1;

Figure 4-6 is a bottom view of Figure 4-2;

Figure 4-7 is a bottom view of Figure 4-3;

Figure 4-8 is a bottom view of Figure 4-4;

1-Copper protective gas nozzle 2-Copper protective gas cavity 3-Confinement bolt 4-Tungsten copper cooling body water cooling channel 5-Bracket 6-Thread 7-Inlet 8-Ceramic tube 9-Copper protective gas nozzle cooling ring 10 -half-split hollow tungsten electrode 11-tungsten copper cooling body 12-water inlet 13-water outlet 14-bakelite 15-screw 16-alloy tube 17 wire feeding mechanism 18-welding wire.

detailed description:

The invention provides a half-split hollow tungsten pole coaxial wire-feeding inert gas shielded welding torch, which includes a copper shielding gas nozzle 1, a red copper shielding gas chamber 2 and a copper shielding gas nozzle cooling ring 9; a copper shielding gas nozzle cooling ring 9 Set on the periphery of the copper protective gas nozzle 1, the copper protective gas chamber 2 is fixed to the bracket 5, and the front of the copper protective gas chamber 2 forms a forward and gradually inward copper protective gas nozzle 1, which is set in the copper protective gas chamber 2 There is a tungsten copper cooling body 11, a gas channel is formed between the tungsten copper cooling body 11 and the inner wall of the copper protective gas chamber 2 (see the arrow position in Figure 1), the gas channel communicates with the copper protective gas nozzle 1, and the tungsten copper cooling The body 11 is provided with a half-split hollow tungsten pole 10, the half-split hollow tungsten pole 10 protrudes from the front end of the tungsten copper cooling body 11, and the welding wire 18 passes through the bracket 5, the tungsten copper cooling body 11 and the half-cracked copper cooling body during use. Type hollow tungsten electrode 10, and merge with the shielding gas sprayed from copper shielding gas nozzle 1.

A cooling water channel 4 is arranged in the tungsten copper cooling body 11 , and the cooling water channel 4 forms a water inlet 12 at the bracket 5 . The welding torch uses the cooling water channel 4 inside the tungsten copper cooling body 11 to indirectly cool the tungsten electrode, which can reduce the loss of the tungsten electrode, increase the welding current and improve the production efficiency;

A ceramic insulating layer or a ceramic insulating tube 8 is arranged between the half-cracked hollow tungsten electrode 10 and the welding wire 18, and the rear end of the ceramic insulating layer or ceramic insulating tube 8 passes through the half-cracked hollow tungsten electrode 10 and extends into the tungsten electrode for red copper cooling. Inside the body 11 and surrounded by cooling water channels 4. Ceramic insulating layer or ceramic insulating tube 8 is to prevent conduction between welding wire and tungsten pole

The tip of the half-split hollow tungsten electrode 10 is tip-shaped and spherical to generate a circular arc. The tungsten tip of the half-split hollow tungsten electrode 10 is inside and at the front end of the copper shielding gas nozzle 1 as shown in Figure 1. It stretches out the copper protective gas nozzle 1 slightly.

The welding wire 18 is first introduced into the alloy tube 16 by the wire feeding mechanism 17 , and then enters the interior of the ceramic tube 8 .

The half-split hollow tungsten electrode 10 is a complete hollow tungsten electrode formed by bonding two half-split hollow tungsten electrodes.

The ceramic insulating layer is manufactured on the inner surface of the tungsten electrode by methods such as spraying.

The gas passage forms air inlets 7 at the bracket 5, and the air inlets 7 are symmetrically distributed. The purpose is to send the shielding gas out of the copper shielding gas nozzle 1 more evenly.

There are 2 sets of confining bolts 3 for fixing the half-cracked hollow tungsten pole 10 and its core, ceramic insulating layer or ceramic insulating tube 8 on the tungsten electrode copper cooling body 11 .

The welding wire 18 is introduced into the interior of the ceramic tube 8 by the wire feeding mechanism 17 and comes out from the tip of the half-cracked hollow tungsten electrode 10 .

As shown in Figure 1, the protective gas enters from the air inlet 7. In order to achieve a good protection effect, two air inlets are designed and symmetrically distributed to ensure that the protective air flow is more uniform and stable;

Referring to Fig. 3, the cooling water enters from the water inlet 12, passes through the water cooling channel 4 of the tungsten copper cooling body, and finally discharges from the water outlet 13. The specific positions of the water inlet 12 and the water outlet 13 can be referred to in Fig. 3. During the working process, the cooling water channel can take away a large amount of heat generated by the tungsten electrode, thereby improving the current carrying capacity of the tungsten electrode, thereby improving production efficiency;

Referring to Figures 4-1 to 4-8, it is the half-split hollow tungsten electrode 10 of the present invention. The half-split hollow tungsten electrode 10 has a simple manufacturing process, and a ceramic tube 8 or an insulating ceramic coating is placed in its core. Contact conduction between the copper cooling bodies 11;

Referring to Figures 4-1 to 4-8, the end of the half-split hollow tungsten electrode 10 can adopt a pointed shape or a hemispherical shape. This method is easy to ignite the arc and the arc is stable. Figure 4-1 shows the form of the outer tip, which gradually becomes smaller from top to bottom; Figure 4-2 shows the form of the inner edge tip, that is, the inner edge gradually becomes larger from top to bottom; Figure 4-3 shows the inner edge and the outer edge Both are in the form of a sharp point, that is, the periphery gradually becomes smaller from top to bottom, and the interior gradually becomes larger from top to bottom; Figure 4-4 shows a circular arc shape in which the periphery gradually becomes smaller from top to bottom, and the inner edge is from top to bottom gradually increasing arc shape.

To sum up, the manufacturing method of the half-split hollow tungsten electrode of the invention is simple, and the core of the hollow tungsten electrode has a ceramic tube or an insulating ceramic coating; During the cladding and additive manufacturing process, the present invention will not be affected by the change of direction to affect the positional relationship between the welding wire and the arc, and is suitable for complex path processing and manufacturing; in addition, the hollow tungsten electrode and the copper shielding gas nozzle have water-cooling channels, which ensures that the hollow tungsten The service life of the electrode and the copper shielding gas nozzle also ensures the stability of the welding performance.

Claims (7)

1. A semi-split hollow tungsten coaxial wire-feeding inert gas shielded welding torch, characterized in that: the welding torch includes a copper shielding gas nozzle (1), a copper shielding gas chamber (2) and a copper shielding gas nozzle cooling ring ( 9); the copper protective gas nozzle cooling ring (9) is arranged on the periphery of the copper protective gas nozzle (1), the copper protective gas chamber (2) is fixed to the bracket (5), and the front of the copper protective gas chamber (2) forms a The copper protective gas nozzle (1) that is gradually retracted before is provided with a tungsten copper cooling body (11) in the copper protective gas cavity (2), and the tungsten copper cooling body (11) and the inner wall of the copper protective gas cavity (2) A gas channel is formed between them, the gas channel communicates with the copper protective gas nozzle (1), and a half-split hollow tungsten electrode (10) is arranged inside the tungsten copper cooling body (11), and the half-split hollow tungsten electrode (10) protrudes The front end of the tungsten copper cooling body (11), when in use, the welding wire (18) passes through the bracket (5), the tungsten copper cooling body (11) and the half-split hollow tungsten electrode (10), and is connected with the copper shielding gas The protective gas ejected from the nozzle (1) converges; A cooling water channel (4) is arranged in the tungsten copper cooling body (11), and the cooling water channel (4) forms a water inlet (12) at the bracket (5): A ceramic insulating layer or ceramic insulating tube (8) is arranged between the half-split hollow tungsten pole (10) and the welding wire (18), and the rear end of the ceramic insulating layer or ceramic insulating tube (8) passes through the half-split hollow tungsten pole (10) extends into the tungsten copper cooling body (11) and is surrounded by cooling water channels (4); The half-split hollow tungsten electrode (10) is a complete hollow tungsten electrode formed by laminating two half-split hollow tungsten electrodes. 2. The half-split hollow tungsten electrode coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: the tip of the half-split hollow tungsten electrode (10) is tip-shaped and Spherical. 3. The semi-split hollow tungsten coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: the welding wire (18) is first introduced into the alloy tube (16) by the wire feeding mechanism (17), Then enter the inside of the ceramic insulating tube (8). 4. The semi-split hollow tungsten pole coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: the ceramic insulating layer is manufactured on the inner surface of the tungsten pole by spraying. 5. The semi-split hollow tungsten coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: the gas channel forms an air inlet (7) at the bracket (5), and the air inlet (7 ) is symmetrically distributed. 6. The semi-split hollow tungsten pole coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: there are 2 groups on the tungsten copper cooling body (11) for fixing the half-split hollow tungsten pole ( 10) and its core, the ceramic insulating layer or the captive bolt (3) of the ceramic insulating tube (8). 7. The semi-split hollow tungsten electrode coaxial wire-feeding inert gas shielded welding torch according to claim 1, characterized in that: the welding wire (18) is guided into the interior of the ceramic insulating tube (8) by the wire feeding mechanism (17), The tip of the split hollow tungsten pole (10) comes out.

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