RU97073U1 - ELECTRODE WELDING TORCH - Google Patents

Abstract

 A torch for welding with a non-consumable electrode, comprising a water-cooled casing having an axial hole, a hollow cathode, in which an auxiliary electrode is placed, which can be connected by means of a current lead to a power source, a hose for supplying plasma-forming gas to the hollow cathode connected to the casing, characterized in that the hole the housing is closed from below with a plug having a through axial hole, a hollow electrode is installed in the plug hole, and the burner is equipped with a nozzle mounted on the housing , in the nozzle there is a water-cooled cavity and an axial hole through which the hollow cathode is passed.

Description

The utility model relates to equipment for welding in a vacuum, namely, to designs of hollow cathode burners made with a channel for supplying plasma-forming gas.

Known a torch for welding by a hollow non-consumable electrode in vacuum, containing a hollow cathode installed in the housing. The cathode cavity through a metering device is connected to a container for inert gas. When this device is operating, the arc discharge is excited by a current source between the hollow cathode and the welded product with the simultaneous supply of a plasma-forming gas.

(see the journal "Welding Production", No. 10, 1974, pp. 1-3).

As a result of the analysis of this device, it should be noted that during the operation of the welding torch, there is a high probability of a vacuum arc in the vapors of the hollow cathode material, and the additional gas supply leads to an increase in pressure in the vacuum chamber, which negatively affects the quality of the weld.

A known torch for welding with a non-consumable electrode in vacuum, containing a hollow cathode, mounted in a cooled case. An auxiliary electrode is placed in the cathode cavity, made in the form of a rod of refractory metal and insulated from the cathode and housing. The auxiliary electrode is connected to the power source by a cable, which is passed through a gas supply hose, worn on the fitting in the upper part of the burner body.

During operation of the burner, a plasma-forming gas enters through the hose into the hollow cathode. After the power source is turned on, a predetermined potential difference is established between the hollow cathode and the product, after which a plasma-forming gas is ionized between the hollow cathode and the auxiliary electrode using a high-frequency discharge, which leads to the initiation of a discharge between the cathode and the product and the welding process of the product is carried out (see USSR certificate No. 551136, class B23K 9/16, 1977) - the closest analogue.

As a result of the analysis of the implementation of this device, it should be noted that when using a torch for welding in hard-to-reach places, when changing its spatial position during the welding process, reliable protection of both the product being welded and the technological equipment (for example, a television system for monitoring the welding process, lighting equipment), from a high-temperature welding arc, as well as from electrical breakdowns obtained by touching a welded product with a hollow electrode and / or processing equipment. In addition, due to the thermal effect of the incandescent hollow cathode, malfunctions of the devices used during welding can occur. All this leads to a decrease in productivity and welding quality.

The objective of this utility model is to increase the productivity and quality of welding, by eliminating electrical breakdowns on the welded product and technological equipment, as well as reducing the thermal effect of the burner on the welded product and technological equipment.

The stated task is ensured by the fact that in the torch for welding with a non-consumable electrode containing a water-cooled body having an axial hole, a hollow cathode in which an auxiliary electrode is placed, which can be connected via a lead wire to a power source, a hose for supplying plasma-forming gas to the hollow is connected to the body the cathode, new is that the bottom of the housing is closed by a plug having a through axial hole, a hollow electrode is installed in the hole of the plug, and the mount The tray is equipped with a nozzle mounted on the housing; the nozzle has a water-cooled cavity and an axial hole through which a hollow cathode is passed.

The essence of the claimed utility model is illustrated by graphic materials, which show a torch for welding with a non-consumable electrode, an axial section.

The torch for welding with a non-consumable electrode contains a water-cooled housing 1 with an axial hole closed at the bottom with a plug 2. The plug 2 has a through axial hole in which the hollow cathode 3 is placed. An auxiliary electrode 4 is inserted into the hollow cathode through the holes of the cathode.

Auxiliary electrode 4 is connected to a high-frequency power source UHF. The connection cable is placed in the plasma-forming gas supply hose 6 through a dispenser from a gas cylinder (not shown).

Outside the burner housing 1, a nozzle 7 is installed with an axial hole through which a hollow cathode is passed. The nozzle 7 has a water-cooled cavity 8, mainly of annular shape, made concentrically to the hollow cathode 3. The nozzle 7 is connected to the housing 1 through a heat-insulating element 9. The cavities of the housing and the nozzle can be connected through fittings 10 to a water cooling system (not shown).

The burner has the ability to be attached to the manipulator through the insulator 11. The item to be welded is indicated at 12.

The torch for welding non-consumable electrode works as follows.

For operation, the burner is fixed on the movable element of the manipulator (not shown). The manipulator, by means of a control program, provides a predetermined gap between the surface to be welded and the end face of the hollow cathode 3 and the law of movement of the torch during welding.

The housing 1 and the product 12 are connected to a power source Usv.

The cooling system of the housing 1 and the nozzle 7 are included in the operation, as a result of which the refrigerant circulates through their cavities.

The plasma-forming gas is fed into the cathode 3 from a cylinder through a dispenser.

Turn on the power source.

A high-frequency discharge voltage Uinch is applied, as a result of which the plasma-forming gas is ionized, which leads to the initiation of a discharge between the hollow cathode 3 and the workpiece 12, by which the welding process takes place.

After the start of the welding process, the voltage UHF is turned off.

During the welding process, the nozzle of the burner burner reliably protects the item being welded (which may have various protrusions, flanges, etc.) from contact with a hot hollow cathode. The nozzle is constantly cooled, which reduces the effect of the thermal field on the welded product and technological equipment, and also allows to ensure the continuity of the welding process, and thereby improve the productivity and quality of welding products in hard-to-reach places.

Claims (1)

A torch for welding with a non-consumable electrode, comprising a water-cooled casing having an axial hole, a hollow cathode, in which an auxiliary electrode is placed, which can be connected by a current lead to a power source, a hose for supplying plasma-forming gas to the hollow cathode connected to the casing, characterized in that the hole the housing is closed from below with a plug having a through axial hole, a hollow electrode is installed in the plug hole, and the burner is equipped with a nozzle mounted on the housing , in the nozzle there is a water-cooled cavity and an axial hole through which the hollow cathode is passed.