CN102528249A - Condensation electric arc welding gun - Google Patents

Abstract

A shrinkage arc welding torch belongs to the technical field of welding equipment. The tungsten electrode is tightly embedded in the center of the electrode seat, and the electrode seat is threaded in the center of the main connecting body. The root of the thread of the electrode seat is connected to the main body with an inclined surface to mesh with each other to ensure the water cooling effect on the electrode and no leakage; the ceramic nozzle passes through the thread The connection sleeve is placed on the outer periphery of the main connecting body; the protective gas laminar flow screen is a stainless steel wire mesh fixed on the other end of the main connecting body with an O-shaped steel wire spring, so that the protective gas forms a laminar flow; the outlet pipe, water inlet casing or inlet There is a cable connection end on the air sleeve; the water inlet sleeve is coaxially sleeved outside the water outlet straight pipe, and the air intake sleeve is sleeved outside the water inlet sleeve, with a water inlet channel left in the middle, and welded to the main connection The same end face of the body forms a water cooling channel and a gas protection channel. Except for the ceramic nozzle, the rest of the materials are conductors. The invention can improve the energy density of the free arc and has better ability to control the formation of the welding seam.

Description

Condensation arc torch

technical field

The invention relates to a welding torch, which is an arc welding torch capable of shrinking the arc and increasing the energy density, and belongs to the technical field of welding equipment.

Background technique

Arc is a form of gas discharge, and the use of arc as a welding heat source has a long history in industrial applications. Since the appearance of the free arc (1885, Benardos Olszewski's carbon electrode arc in Russia), the optimization of the structure and characteristics of the arc has always been a focus of attention of academic and engineering professionals at home and abroad. In the 1940s, the NorthropGrumman Company of the United States invented the tungsten inert gas shielded welding torch and technology, which improved the energy density and controllability of the arc, and showed excellent effects on the quality of metal material welding. For more than half a century thereafter, the form of this welding torch has not changed. Its outstanding shortcoming in production and use is that the arc of the welding torch is in a free burning state, and the energy density is difficult to further increase, resulting in welding production efficiency. Difficult to improve. At the same time, the heat input and heat-affected zone of the welded joint are too large, resulting in large post-weld deformation and residual stress. Therefore, from the analysis of the physical properties of the free arc, it is difficult to achieve a high energy density arc that can meet the needs of efficient welding by increasing the input of electric power.

Contents of the invention

The object of the present invention is to provide a shrinkage arc welding torch, which is a new structure capable of increasing the energy density of the free arc.

The shrinking arc welding torch of the present invention is characterized in that it includes a tungsten pole, an electrode seat, a ceramic nozzle, a main connecting body, a protective gas laminar flow screen, a straight water outlet pipe, a water inlet casing, an air inlet casing, and a cable connection end.

The main connecting body is a circular cylinder with threads on the inner and outer sides; one end of the straight water outlet pipe is coaxially welded to one end of the main connecting body and has a through hole; the water inlet casing is coaxially sleeved on the straight water outlet pipe On the outside, there is a water inlet channel in the middle, and the water inlet channel is connected with the straight water outlet pipe through the hole on the straight water outlet pipe. The pipes are sealed and welded together, and have a water inlet; the air inlet sleeve is coaxially sleeved outside the water inlet sleeve, with an air inlet passage in the middle, and the air inlet sleeve is also welded on the same end face of the main connecting body, and is equipped with Air inlet; at the air inlet channel, the main connecting body is provided with a through hole along the axial direction.

The tungsten electrode is tightly embedded in the center of the electrode holder 1, and the outer circumference of one end of the electrode holder is provided with an external thread, which is connected and fixed with the main connecting body 3. The thread root of the electrode holder 1 and the main body connection 3 adopt a slope to mesh with each other. This specially designed water The airtight structure not only ensures the water cooling effect on the electrode without leakage, but also is simple and convenient when replacing the electrode, and the electrode and the electrode holder can be used repeatedly; the inner thread of the ceramic nozzle 2 is fixed to the outer thread of the main body connection 3 Connected so that the ceramic nozzle 2 is set on the outer periphery of the main connecting body 3, and the ceramic nozzle 2 can use a commercially available welding ceramic nozzle standard part to ensure the source of replacement and spare parts; the electrode seat and the main connecting body are all in the cavity of the ceramic nozzle Among them, the length of the electrode seat is longer than that of the main connecting body, and a gas cavity is formed between the part of the electrode seat without the main connecting body and the ceramic nozzle; the protective gas laminar flow screen 4 is fixed on the other end of the main connecting body with an O-shaped steel wire spring The stainless steel wire mesh makes the protective gas form a laminar flow; the outlet pipe, water inlet sleeve or inlet sleeve is provided with a cable connection end 9. Above-mentioned except ceramic nozzle 2, all the other materials are conductors.

Preferably, except for the purchased standard parts (ceramic nozzles), the main connecting body 3 is made of brass, and the rest are all made of red copper. Preferably, the cable connection end is welded on the outside of the water inlet casing.

The forced immersion water cooling of the electrode forms the necessary conditions to limit and restrict the range of "thermal electron emission" produced by the electrode end, which increases the current density flowing through the tungsten end and produces a strong "self-magnetic shrinkage" effect, forming The narrower ionized gas channel makes the energy density of the arc higher than that of traditional gas tungsten shielded welding arc.

The converging arc of the present invention has the characteristics of high energy density under the same current input. In terms of welding process effect, the high energy density of the arc is beneficial to increase the penetration depth of the weld, reduce the heat input to the workpiece, and reduce the The size of the weld seam and heat-affected zone improves welding production efficiency. This kind of arc heat source has a better ability to control the shape of the weld seam during welding.

The welding torch of the invention can work in various current modes such as direct current, alternating current and pulse. The maximum current in continuous operation is 300A. It is suitable for welding stainless steel, alloy steel or carbon steel plate with a thickness of less than 3mm, and also suitable for welding aluminum alloy materials with a thickness of 2mm or less.

Description of drawings

Fig. 1 Structural diagram of the condensation arc welding torch;

1-electrode holder (including tungsten pole), 2-ceramic nozzle (commercially available standard), 3-main connector, 4-protective gas laminar flow screen (including O-shaped wire spring), 5-water inlet casing, 6-water outlet straight pipe, 7-intake sleeve, 8-tower connector, 9-cable connection end.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

Example 1

The structural diagram of the polycondensation arc welding torch is shown in Figure 1. The main connecting body 3 is a circular cylinder with threads on the inner and outer sides; one end of the water outlet straight pipe 6 is coaxially welded on one end surface of the main connecting body, and has a through hole ; The water inlet casing 5 is coaxially sleeved on the outside of the water outlet straight pipe, and there is a water inlet channel in the middle. The water inlet channel communicates with the water outlet straight pipe through the hole on the water outlet straight pipe. On the same end face, the other end of the water inlet casing is sealed and welded with the outlet straight pipe, and a water inlet is provided; the inlet casing 7 is coaxially sleeved outside the water inlet casing, and an air inlet channel is left in the middle. The pipe is also welded on the same end face of the main connecting body, and is provided with an air inlet; at the air inlet channel, the main connecting body has a through hole along the axial direction.

The tungsten electrode is tightly embedded in the center of the electrode holder 1, and the outer circumference of one end of the electrode holder is provided with an external thread, which is connected and fixed with the main connecting body 3. The thread root of the electrode holder 1 and the main body connection 3 adopt a slope to mesh with each other. This specially designed water The airtight structure not only ensures the water cooling effect on the electrode without leakage, but also is simple and convenient when replacing the electrode, and the electrode and the electrode holder can be used repeatedly; the inner thread of the ceramic nozzle 2 is fixed to the outer thread of the main body connection 3 Connect, so that the ceramic nozzle 2 is set on the outer periphery of the main connecting body 3, and the ceramic nozzle 2 adopts a commercially available welding ceramic nozzle standard part to ensure the source of replacement and spare parts; the electrode seat and the main connecting body are all in the cavity of the ceramic nozzle , the length of the electrode seat is longer than the main connecting body, and a gas cavity is formed between the part of the electrode seat without the main connecting body and the ceramic nozzle; the protective gas laminar flow screen 4 is fixed on the other end of the main connecting body with an O-shaped steel wire spring Stainless steel wire mesh makes the protective gas form a laminar flow; the water inlet casing is provided with a cable connection end 9. Except for the ceramic nozzle 2 mentioned above, the main connecting body 3 is made of brass material, and the rest are made of red copper material. The outlet straight pipe water outlet, the air inlet and the water inlet are also equipped with a tower joint 8; the cable connection end 9 is to be connected with the electric welding machine.

When working, water enters the water inlet channel from the water inlet joint, enters the water outlet straight pipe through the hole on the water outlet straight pipe, and circulates. Enter the air inlet channel, pass through the through hole on the main connecting body and the protective gas laminar flow screen, form a uniform laminar flow gas, enter the gas cavity between the ceramic nozzle and the electrode seat, and then directly reach the workpiece.

Before welding starts, it is necessary to check whether the water cooling circuit is working properly. The adopted water-cooling device can be self-contained on the welding machine, and also can be a commercially available standard product used for cooling the water-cooled welding torch. According to the actual needs of the welding process, set the parameters of the welding power source, or optimize the welding parameters in real time. When the welding is finished or temporarily interrupted, continue to keep the welding torch water-cooled for 1-2 minutes to fully cool the welding torch, which is conducive to improving the service life of the welding torch. Others have no special requirements for operation.

Claims (4)

1. the bunching arc welding gun is characterized in that, comprises tungsten electrode, electrode tip holder, ceramic nozzle, main connector, protective gas laminar flow sieve, water outlet straight tube, water inlet sleeve pipe, air inlet sleeve pipe, cable link;

Main connector is a circle ring column, and inside and outside equal side is provided with screw thread; One end coaxial welding of water outlet straight tube is at an end face of main connector, and has through hole; The coaxial outside that is enclosed within the water outlet straight tube of water inlet sleeve pipe; Intake tunnel is left in the centre; Intake tunnel is communicated with the water outlet straight tube through the hole on the water outlet straight tube; The water inlet sleeve pipe is welded on the same end face of main connector equally, and the water inlet sleeve pipe other end then is connected together with the seal weld of water outlet straight tube, and is provided with water inlet; The coaxial into water cover tube outside that is enclosed within of air inlet sleeve pipe, inlet channel is left in the centre, and the air inlet sleeve pipe is welded on the same end face of main connector equally, and is provided with air inlet; At the inlet channel place, main connector has through hole vertically;

Tungsten electrode closely is embedded in the center of electrode tip holder, and an end periphery of electrode tip holder is provided with external screw thread, is connected with main connector to fix, and is connected with main body at the electrode tip holder thread root and adopts the inclined-plane to be meshing with each other, and guarantees the water-cooled of electrode is but acted on and ne-leakage; The external screw thread that the internal thread of ceramic nozzle is connected with main body is fixedly connected, and makes ceramic nozzle be enclosed within the periphery of main connector; Electrode tip holder, main connector all are in the cavity of ceramic nozzle, and the length of electrode tip holder is greater than main connector, between the partial electrode seat of dereliction connector and ceramic nozzle, form gas cavity; Protective gas laminar flow sieve is the stainless steel cloth that is fixed on main connector other end with O shaped steel silk spring, makes protective gas form the laminar flow shape; Outlet pipe, water inlet sleeve pipe or air inlet sleeve pipe are provided with the cable link;

Above-mentioned electrode tip holder, main connector, protective gas laminar flow sieve, water outlet straight tube, water inlet sleeve pipe, air inlet sleeve pipe and cable link are conductor.

2. according to the bunching arc welding gun of claim 1, it is characterized in that main connector adopts brass material, electrode tip holder, water outlet straight tube, water inlet sleeve pipe, air inlet sleeve pipe and cable link all adopt the red copper material.

3. according to the bunching arc welding gun of claim 1, it is characterized in that the water side of air inlet, water inlet and water outlet straight tube all is equipped with joint.

4. according to the bunching arc welding gun of claim 1, it is characterized in that the cable link is welded on into water outside of sleeve.