RU2358846C1 - Miniature toch for arc welding by nonconsumable electrode in protective gas atmosphere - Google Patents

Abstract

FIELD: production processes.

SUBSTANCE: invention can be used for welding in space-limited environment. The proposed torch comprises a casing, nozzle, collet chuck, nonconsumable electrode, gas lens, cooling water and protective gas pipes arranged in the same horizontal pane. The casing is formed by the cooling water pipe circular loop. The loop lower side accommodates a bush attached thereto long with the collet chuck and nozzle, while the plug is mounted on the loop upper part. To add to the torch efficiency, cooling water feed and discharge pipe may have various cross sections.

EFFECT: expanded performances due to possibility of use in space-limited environment.

2 dwg

Description

The invention relates to the field of welding production and can be used for welding structures in hard to reach places.

Known torch for arc welding with a non-consumable electrode in a protective gas medium (USSR Author's Certificate No. 1291425, class B23K 9/16). The burner has a housing, a water-cooled metal nozzle, a grip for gripping a non-consumable electrode with a smooth conical surface, a pressure nut and a non-consumable electrode. The collet has tight contact with the inner conical surface of the nozzle for a length equal to 7 ... 10 electrode diameters.

A known torch for arc welding by a non-consumable electrode in a shielding gas medium (USSR Author's Certificate No. 1117164, class B23K 9/16), which comprises a housing with radial channels for supplying a protective gas, a conical collet fixed to the body for clamping the non-consumable electrode and a nozzle forming annular clearance with the housing and communicating with radial channels.

The closest technical solution to the proposed one is a burner containing a housing with a jacket, a ceramic nozzle, a collet for clamping a non-consumable electrode with an external conical thread and axial channels, a gas lens and cooling water and protective gas supply tubes located in one horizontal plane (Copyright certificate of the Russian Federation No. 2242343, class B23K 9/167).

A common disadvantage of these designs is the lack of compactness of the torches, which makes them difficult to use for welding in confined spaces.

The technical task of the proposed solution is to increase the operational characteristics of the torch due to the possibility of its use for welding in hard to reach places.

The technical result is achieved by the fact that in the known torch for arc welding with a non-consumable electrode in a shielding gas medium comprising a body, a nozzle, a clamping collet, a non-consumable electrode, a gas lens, cooling water and protective gas tubes located in one horizontal plane, the body is formed by an annular loop cooling water tubes, a sleeve with a collet and nozzle connected to it is fixed on the lower side of this tube section, and a plug is installed on the upper side.

Figure 1 shows a longitudinal section of the burner, figure 2 is a transverse section in the plane of the tubes.

The burner contains a ceramic nozzle 1 with a sleeve 2, a split collet 3 with a non-consumable electrode 4, a gas lens 5, tubes 6 and 7, a plug 8, a layer of heat-resistant insulation 9. An annular loop of the tube 7 forms the burner body 10. The sleeve, tubes and plug are brazed.

The burner operates as follows. A collet 3 having an external conical thread and a longitudinal section is screwed into the sleeve 2 of the nozzle 1 to ensure clamping of the electrode. The welding current passes through the tubes 6, 7, the sleeve 2 and through the collet goes to the electrode 4. The protective gas flows through the tube 6 into the cavity 11 of the housing 10, limited by the ring loop of the water supply tube 7 and the plug 8, then passes through the holes 12 in the collet and through the gas lens 5 enters the nozzle 1. When passing through the gas lens, a laminar flow of protective gas is provided. Cooling water enters the burner along one of the branches of the tube 7, goes around the central cavity and leaves the other branch. The absence of stagnant zones, differential sections and other local resistances in the water inlet and outlet lines improves the cooling conditions of the burner. To improve the heat removal from the burner, the water supply tube 7 can be made of a different profile.

The technical solution allows to improve the operational characteristics of the burner due to the possibility of its use for welding in hard-to-reach places and to ensure effective heat removal, as well as to simplify the design of the burner and increase its reliability.

Claims (1)

A small-sized torch for arc welding with a non-consumable electrode in a shielding gas medium, comprising a housing, a nozzle, a clamp collet, a non-consumable electrode, a gas lens, cooling water and protective gas tubes located in one horizontal plane, and a plug, characterized in that the body is formed by an annular loop cooling water tubes, while on the lower side of the annular loop a sleeve is fixed with a clamping collet and nozzle connected to it, and a plug is installed on its upper side.

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