Torch for electric arc gas-shield welding by means of non-consumable electrode

FIELD: gas-shield welding process with use of non-consumable electrode, namely torches for such welding.

SUBSTANCE: torch includes body of collet chuck holder. Said body has cylindrical surface near its working end and it is welded to electrically conducting gas conduit. Collet chuck is mounted in body for securing non-consumable electrode. Nozzle has cylindrical surface passing to cone surface and then again passing to cylindrical surface near its working end. Asbestos-cement insulator is arranged on surface of body of collet chuck holder; brass sleeve is put onto said insulator. Insulator is fixed to body by means of pressure ring-splitter having cylindrical surface passing to cone surface with radial openings.

EFFECT: possibility for making small-size torch for welding butts of metallic structures in hard-to-reach places of installation zone.

2 dwg

 

1. Copyright certificate 206766, the IPC 23 To 9/16.

Famous torch for arc welding with a consumable electrode in a protective gases includes a housing, made with a cylindrical surface, which merges into the conical working end that is inserted into the collet housing for mounting a non-consumable electrode and forming with the housing a chamber for shielding gas, inclined to the axis of the burner radial channels made in the housing and fixed to the body of the nozzle.

A disadvantage of the known burner is a significant length of the welding head, which does not allow its use for welding in confined conditions at the place of installation. Additional shortening of the nozzle between the casing and the work end without changes to the hull design leads to the inevitable deterioration of gas protection or violation.

2. Copyright certificate 1704981, the IPC 23 To 9/167.

Famous torch for arc welding with a consumable electrode in a protective gas containing the cooling jacket veroobrazno form, covering the body with a longitudinal axial channel under the collet to secure the electrode. Under the cover of the mixing chamber is connected by canals with soothing camera, which is converted to the output channel, made of conical shape with an angle, the vertex of which is located at the tip of the electrode.

The disadvantage is zvetnoi burner is a hard dependency of volume mixing and soothing cameras to the electrode diameter and angle on the nozzle to the expiration of the laminar gas flow. Because the maximum shortening of the nozzle, from the working end to the body of the burner, there is practically no Luggage calm and longitudinal axial channels increase stroinosti protective gas at the nozzle exit.

3. Copyright certificate 1117164, the IPC 23 To 9/16.

Closest to the technical essence and the technical result is a torch for arc welding with a consumable electrode in a protective gases in confined conditions, comprising a housing, made with a cylindrical surface, which merges into the conical working end that is inserted into the collet housing for mounting a non-consumable electrode and forming with the housing a chamber for shielding gas, the radial channels made in the cylindrical surface, and fixed to the body of the nozzle relative to the surface of the nozzle annular gap, and the axis of radial channels are perpendicular to the axis of the burner.

The disadvantage of this burner is that the ceramic nozzle line of the pair of outer thread of the housing and the internal threads of the nozzle is transferred to the clamping collet for attaching a tungsten electrode when heated. When execution of the thread in one direction pairing is filled with heat-resistant mastic to not vinculos nozzle during the liberation of tungsten. Dropping the torch or blow to remixes.cue the nozzle is broken. The outer groove collets for better passage of shielding gas through the radial holes of the housing allows the shielding gas flow to pass through sawn through the slots of the collet, which in turn, increases stroinosti at the working end of the nozzle.

The maximum reduced length of the burner from the end of the nozzle to the housing in this design does not allow to create a sufficient protective gas chamber calm inside the nozzle, which, in turn, reduces laminarinase flow of shielding gas to the weld zone. Due to the forced reduction of departure tungsten electrode is reduced and review the weld zone.

The perpendicular radial holes of the housing in this design does not solve the problem of turbulence due to the small annular gap, where is the kinetic energy of the numerous streams that occur in the path of flow of the protective gas, to meet further resistance.

Degree of protection insulation exposed surfaces of the housing and the conductors are insufficient for long-lasting operation of the burner in terms of the place of installation or repair of existing facilities.

The principle of operation of the burner.

Figure 1 presents a General view of a gas burner for electric arc welding in protective gases. Figure 2 - its longitudinal section. The burner includes a housing of carterites 2, welded to chocolateproduct 13, ypolnennye with a cylindrical surface at its working end, installed in the housing carterites the collet 1 for mounting a non-consumable electrode 7. On the outer surface of the housing 2 has an insulator 3 having a cylindrical surface with made the longitudinal axis of the grooves 9 on the inner surface planted with him a brass bushing 5. The clamping ring divider 4, made with a cylindrical surface which merges into a conical, made of radial holes form a mixing chamber 8 for the shielding gas. In the wall of the housing carterites 2 has a groove with a radial hole 10. The sleeve 5 is fixed to the nozzle 6.

Shielding gas flows through the radial holes 10 of the body of carterites 2 on the longitudinal grooves 9 asbestos insulator 3 in the mixing chamber 8 and through the radial channels 11 of the clamping ring divider strip 4 in soothing the camera 12. The internal diameter of the brass nozzle with thread M H,5 and its configuration with the outer surface of the collet and the clamping ring to create a three-dimensional stilling chamber 12, where a laminar flow of shielding gas, and the cylindrical section of the nozzle from its face up to 10 mm compacts laminar gas flow at the nozzle exit on the length up to 20 mm, This allows you to work the flight electrode to 17 mm, which improves visibility of the weld zone. If necessary, the nozzle can be odlin the th nozzle of any length on a cylindrical section at the working end.

Practice has shown that welding joints consumption of protective gas is 4-8 l/min This saves inert gas up to 80%.

All the parts of the burner are made on a lathe from one installation of the workpiece in the Chuck, which provides good alignment with their Assembly about the axis of the burner nozzle.

When welding titanium mandatory applies breaker source of welding current, which is driven by a button mounted on the handle of the burner. The handle of the burner is made of heat-resistant insulating material.

Practice found that the overall length of the burner from its nozzle to the end of the arm is directly connected with the maneuverability and ease of execution quality of the weld. Burner length up to 200 mm facilitates the wrist strain when working welder that allows you to increase the cycle in one step, from the initial ignition of the arc to its breakage after fusing roller.

Currently, the structures of welding torches, there is the problem of isolating metal nozzle from the conductors. Typically, manufacturers use insulators of heat-resistant ceramics in the form of rings, gaskets, bushings, etc., or heat-resistant materials from getinsa, stellocentric etc.

Ceramic insulators represents the t of a complex manufacturing the product and constantly burst, crack, crumble, and are manufactured in the factory. In practice when welding joints at the place of installation or repair, stove with ceramic insulators, the application is not found. Insulators from other insulators are easily damaged due to their burning.

The use of burners with ceramic nozzles also found use in the welding of joints in the installation or repair due to the fact that in case of accidental fall of the burner, the blow nozzle or wet, hot nozzle, it bursts, the carving is painted on the nozzle due to poor mating threads on ceramics and carvings on the metal.

The use of asbestos insulator and the head design of the nozzle allows to solve the problem, apply the nozzle of metal, without complicating the construction of the burner, and increases the durability at high currents. Asbestos cement brand PTA 400 for manufacturing an insulator is used for thermal insulation of industrial and power equipment at a temperature of insulated surfaces up to 500°C. the Material is non-flammable and non-explosive, the operation does not evolve and does not form with other substances, toxic compounds and comes in TOUTCH-001243.0045-94. Made the insulator, it is advisable to cover the heat-resistant varnish.

A constructive solution of carterites 2, asbestos is solator 3 together with the holding ring-divider 4 fundamentally solves the whole system is created protect the weld pool and head design of the nozzle as a whole and allows you to use this torch for welding of pipelines and steel in all positions at the place of installation or repair of existing shops on the operating equipment.

The burner has stood the test of practice on "acid" piping Copper plant Norilsk mining and metallurgical combine in copper electrolysis. Welding joints was carried out on pipelines with diameter from 10 to 600 mm of steel austenitic grades 08KH18N10T and titanium grades W-4 butt, corner and lap joints.

A torch for arc welding with a consumable electrode in a protective gas containing body carterites made with a cylindrical surface at its working end and welded to chocolateproduct installed in the housing of the collet for attaching a non-consumable electrode and the nozzle is made with a cylindrical surface, followed by a taper, and then in the cylindrical working end, wherein on the surface of the body carterites installed asbestos insulator planted on him by a brass bushing fixed on the housing by means of the clamping ring divider made with a cylindrical surface which merges into a conical radial holes perpendicular to the axis of the nozzle, which mounted on a brass bushing.



 

Same patents:

FIELD: machine engineering, possibly gas-shield electric arc welding by means of non-consumable electrode.

SUBSTANCE: method comprises steps of alternatively feeding several gases or their mixtures by pulses; at each next pulse feed using gases (gas mixtures) having ionization potentials different in comparison with those of gases or gas mixtures of previous pulse feed; periodically changing electric arc gap simultaneously with gas feed pulses; setting basic voltage of electric arc equal to optimal voltage in medium of gas or gas mixture with minimum ionization potential; setting difference between maximum and minimum voltage values of arc at periods of previous and next pulse feed of gases or gas mixtures in range 1 - 7 V.

EFFECT: enhanced quality of welded joints, possibility for adjusting fusion depth.

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EFFECT: enhanced quality of welded joints, possibility for adjusting fusion depth.

1 tbl, 1 ex

FIELD: gas-shield welding process with use of non-consumable electrode, namely torches for such welding.

SUBSTANCE: torch includes body of collet chuck holder. Said body has cylindrical surface near its working end and it is welded to electrically conducting gas conduit. Collet chuck is mounted in body for securing non-consumable electrode. Nozzle has cylindrical surface passing to cone surface and then again passing to cylindrical surface near its working end. Asbestos-cement insulator is arranged on surface of body of collet chuck holder; brass sleeve is put onto said insulator. Insulator is fixed to body by means of pressure ring-splitter having cylindrical surface passing to cone surface with radial openings.

EFFECT: possibility for making small-size torch for welding butts of metallic structures in hard-to-reach places of installation zone.

2 dwg

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2 tbl

FIELD: mechanical engineering; welding.

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5 cl, 2 dwg

FIELD: technological processes.

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EFFECT: improved quality of weld seams in overlapping joints of steel pipes, reduced hopping during rotation of long-length welded article, reduced cost of welded product.

3 cl, 3 dwg, 1 tbl

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