DE1100204B - Inert gas arc torch for cutting and welding with non-consumable electrode and constricted arc - Google Patents

Description

GERMAN

The invention relates to a protective gas arc torch for cutting and welding by means of an arc burning between a non-melting electrode and the material, which is constricted by a narrowing nozzle together with the protective gas flow concentrically surrounding it, with a device for pushing the electrode out of the Nozzle for the purpose of igniting the arc and then retracting the electrode. - '".

In these known burners with electrodes that can be advanced to ignite the arc, this is done Retraction either by spring force or by electromagnets. However, electromagnets increase the weight the welding gun considerably, making the welder easy to tire. The use of spring force retraction of the electrode requires ejecting the electrode from the nozzle, if no electromagnets are to be used, has been carried out with finger force. Also because of that the welder becomes tired in the long run, especially in the calm position of the gun hindered by the actuation necessarily associated with a certain exertion of force the trigger to advance the electrode, so that an undesired lateral movement of the electrode or the ignited arc is often unavoidable.

The invention aims to eliminate the disadvantages of the known torch and the welder a To provide torch that is light and in which the advancing movement of the electrode without Exertion of force, only at a light finger pressure, takes place pneumatically.

The invention consists in that the device for withdrawing the electrode is carried out pneumatically Tapping of the shielding gas line is actuated.

The drawing shows an embodiment of the invention. The burner has a tubular upper and lower part 1 and 2, both of which are screwed together by means of the threaded pin 3. The bore of the part 2 has an inner collar 4 against which the block 5 is supported under the pressure of the threaded pin 3. The block 5 has a central bore 6 for the tungsten electrode 7, the tip 8 of which is provided with a flat. The electrode 7 is connected by the screw 9 to the piston 10, which rests in the upper burner part 1 in the drawn state on a collar under the pressure of the spring 11, which is supported against the cap 13 with the pin part 12, which is used for screwing with the Part 1 serves. The head 14 of the electrode 7 can move upwards in the bore 15 of the cap 13, this path being limited

Inert gas arc torch

for cutting and welding

with non-consumable electrode

and constricted arc

Applicant:
Marston Excelsior Limited, London

Representative: Dipl.-Ing. A. Bohr, Munich 5,

Dr.-Ing. H. Fincke, Berlin-Lichterfelde, Drakestr. 51,

Dipl.-Ing. H. Bohr and Dipl.-Ing. S. Staeger, Munich 5,

Patent attorneys

Claimed priority:
Great Britain March 27, 1957 and March 19, 1958

Kenneth James Clews, Walsall, Staffordshire,
and Godfrey Brian Roberts, Brewood, Staffordshire

(Great Britain),
have been named as inventors

through the stop bolt 16 with the locking nut 17 in the cap 13.

Between the block 5 and the piston 10 there is a chamber with an inlet opening 18 for the Protective gas that flows out of the line 20 fastened with nipple 19 and the piston 10 against the effect the spring 11 lifts.

The block 5 has a cooling chamber 23 which is in communication with inlet and outlet lines 21. In one of the lines 21 runs the power cable, not shown, which carries the welding current over the current-conducting Block 5 leads to electrode 7. The protective gas intended for the torch nozzle flows through the Line 25 into the block and through line 24 from this downwards.

At the lower end of the burner part 2, a socket 26 for the nozzle head 30 is screwed, the one has inner cooling chamber 27 with inflow and outflow lines 28 for the cooling medium. The inner hole the socket 26 is tapered conically at 29 in order to guide the gas to the nozzle in a vortex-free manner. Rejuvenated at this The nozzle holder 30 screwed into the socket 26 connects to the bore hole, into which the actual Nozzle 32 is screwed in. The bore 31 of the nozzle 32 is tapered at the outlet at 33 to the burning Narrow the arc and the surrounding concentric gas flow.

109 527/482

The burner parts 1 and 2 and the cap 13 are made of insulating material so that the nozzle does not is live.

In the depicted retirement of the torch, the electrode protrudes a bit from the nozzle. In well-known Way, the ignition can be done by a high frequency current; in that the electrode closer to the material than the nozzle itself, electrostatic charging of the nozzle can result the high frequency current does not occur. After the arc has struck, the connection between the line 20 and the protective gas main line produced, and by the pressure of the protective gas is the piston 10 moves up to the stop of the electrode head 14 on the stop pin 16 and takes the electrode with it, so that its tip retracts into the further nozzle bore 31. Arc on Inert gas streams are then constricted and concentrated in the desired manner through the nozzle mouth 33. When the burner is switched off, the electrode automatically moves out of the nozzle again and is thus ready for the next ignition process.

Claims (1)

PATENT CLAIM: Inert gas arc torch for cutting ■ and welding by means of one between one not consumable electrode and the material of the burning arc, which together with the it is constricted concentrically surrounding inert gas flow by a narrowing nozzle, with a device for ejecting the electrode from the nozzle for the purpose of igniting the arc and for the subsequent retraction of the electrode, characterized in that the device (10) for withdrawing the electrode (7) pneumatically by tapping the protective gas line is operated. Considered publications:
U.S. Patent No. 2,702,333;
The Welding Journal, November 1955, pp. 1097/1098. Legacy Patents Considered:
German Patent No. 1,066,676. 1 sheet of drawings © 109 527/482 2.61