DE2332066A1 - METHOD AND ARRANGEMENT FOR THE SIMULTANEOUS OPERATION OF TWO PLASMA TORCHES FOR WELDING OR CUTTING METALS - Google Patents

Description

Applicant:

Central institute for welding technology of DDB 2332066

403 Halle (Saale), Köthener Str.33a

Method and arrangement for the simultaneous operation of two plasma torches for welding or cutting metals

The invention relates to a method and arrangement for simultaneously operating two plasma torches for welding or cutting metals that are operated individually or together on a common power source

Process and arrangement are known for plasma cutting » where one plasma torch or two plasma torches « E.g. a hand and a machine torch are arranged * Here, however, only one plasma torch is operated optionally »

There are also portals and movement facilities known that are equipped with two or more plasma torches working simultaneously, but for each plasma torch a separate plasma system, consisting of a main power source, control and accessories, is required. The disadvantage of all prior art methods and arrangements in plasma cutting or welding consists in the fact that when several plasma torches are operated at the same time, e.g. when cutting lamellas, for each Plasma torch its own plasma system must be arranged · This doubles the technical and economic effort considerable if two plasma torches are to be operated simultaneously although in most applications the electrical output of almost all plasma power sources for daa operation two plasma torches would be sufficient

The purpose of the invention is therefore in plasma welding and cutting with the simultaneous operation of two plasma torches with simple means the technical and to reduce economic costs

409807/0720

The invention is based on the object of a method to operate two plasma torches for welding and cutting metals, to be developed by the arrangement suitable means the power range of the power source belonging to a plasma system is used so that both Plasma torch operated by a common power source and doubling the plasma systems in the previous way can be dispensed with.

The object of the invention is achieved in that the arc voltage of the plasma torch to be ignited first is limited and added to the limiting voltage, is fed to the second plasma torch during the ignition process, after which Ignition, the voltage limitation is to be removed or replaced by a voltage control *

For simultaneous operation of the two plasma torches, one or more limiting resistors connected in series are arranged in the main circuit of at least one plasma torch, with one of the limiting resistors being connected in parallel with a contactor contact which is activated by activating ^{1 of} a contactor via a current relay arranged in the main circuit of the further plasma torch when the Main arc bridges the limiting resistor

Zar setting of different welding or cutting parameters are the limiting resistors adjustable "

The advantages of the invention are that on a in a simple way enables the simultaneous operation of two plasma torches as well as the known principles of plasma technology and a complete plasma system is saved as a significant economic advantage.

The invention is to be based on two exemplary embodiments and the accompanying drawings are explained in more detail *

409807/0720

Fig. 1: shows an arrangement for parallel-connected Plasma torch with two separate limiting resistors in the main circuit

FIG. 2 t shows an arrangement for plasma torches connected in parallel with a limiting resistor in the main circuit

In Fig. 1, the pilot arcs of the plasma torches 1; supplied by the auxiliary power sources 3. If the main arc of the plasma torch 1 ignites on the workpiece 11, then, depending on the current relay, 4- das Contactor 5 actuates whereby resistor 6 is bridged. This means that the burner 2 is directly connected to the power source 7. When the burner 2 is ignited, the current relay 8 the contactor 9 is actuated, whereby the resistor 10 is bridged and both torches are directly supplied by the power source 7 be fed. By partially switching off one of the resistors 6; 10 or both resistors 6; 10 can affect the parameters of the two plasma torches. Sequence of ignition or shutdown of the two plasma torches 1 ; 2 and their operating time are unlimited. The control voltage is supplied by the power supply unit 12.

In FIG. 2, the film arc of the plasma torch 1 is fed by the main power source 7 and limited via the resistor 13. The pilot arc of the plasma torch 2 is supplied by the auxiliary power source 3. The sequence of ignition of the two main arcs begins with plasma torch 1. If the main arc of plasma torch 1 ignites, the main current is limited via resistor 14-. When the main arc is subsequently ignited with plasma torch 2, resistor 14 is bridged via contactor 15 as a function of current relay 8, whereby both plasma torches 1; 2 are connected directly to the main power source 7. If the main arc is interrupted at one of the plasma torches, then the auxiliary 16 is actuated via the current relay 4 or 8, whereby the control 17 effects the setting of a different working range on the power source 7. Will be used on both Plasmaorennern ί; <± the main arc and

AO98O7 / O720

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interrupted, then depending on the current relay 18 the initial position of the control is restoredIf the main arc of plasma torch 2 ignites first, then the resistor 14 · is bridged immediately, and the control 17 of the power source 7 sets the working range for a plasma torch · The main arc of the plasma torch 1 cannot ignite in this case.

409807/0720

Claims (1)

Claims 1 ». 'Procedure for operating two plasma torches at the same time for welding or cutting metals, individually or together on a common power source are operated, characterized in that the current strength of the plasma torch to be ignited first (1} 2) limited and the arc voltage of the same to the limit voltage added to the second plasma torch (1} 2) is supplied during the ignition process, after which the voltage limitation is canceled or is to be replaced by a voltage regulator 2 · Arrangement for carrying out the method according to claim 1 characterized in that in the main circuit (20) at least one plasma torch (1) 2) one or more limiting resistors (6; 10j connected in series) 13; 14) are arranged, with at least one of the limiting resistors (6; 10; 13; 14) a contactor contact (19) is connected in parallel, which is activated by the contactor (5; 9i 15) via one in the main circuit (20) further Plasma torch (1; 2) arranged current relay (4; 8; 16j 18) when the main arc is ignited, the limiting resistor (6ι 10; 13; 14) bridged 3. Arrangement for performing the method according to claim 1 and 2, characterized in that the limiting resistors (6; 10; 13; 14) for setting different · Welding or cutting parameters are adjustable. - Two sheets of drawings - 409807/0720