DD281978A5 - ZUG-PRESSURE WIRE FEEDER FOR MIG / MAG WELDING - Google Patents

Abstract

The invention relates to a device for feeding Schweiszdraht when welding with abschmelzender electrode or additional wire. It is essential to the invention that the implementation of the wire guide after the main feed with one or more train modules and variable length Kabelstuecken in multiple variation durchfuehrbar, the modules necessary for this, similar interconnectable Zentralanschluszverbindungen and Einfuehrungs- or UEbertragungselemente for the electrode wire, the inert gas, the Schweiszstrom and have the oscillating armature control voltage. Furthermore, it is typical that the excitation coils of the train modules are provided with a series diode, the direction of effect or Überbrueckung depending on the required technological conditions can be determined and a common power supply of all train modules via a symmetrical AC voltage with fixed or veraenderlicher frequency. The function of the series diodes is expressed by the fact that, with the same polarity, the doubling of the feed force and, in the case of different polarities, an alternating mode of operation with doubled feed frequency and doubled average feed rate are effected. The invention is best illustrated in FIG. Fig. 1 {Drahtfuehrung; Main feed; tensile modulus; Kabelstueck; Zentralanschluszverbindung; Introduction or transmission elements; Excitation coils; Series diode; Mode of operation; Feed force, -frequency, -speed}

Description

-2- 281978 Explanation of the nature of the invention

It is an object of the invention, using only one type train module / basic module to develop the veschiedenartig combinations of pulsating traction drives, while easy to design assembly, electrical connection and commissioning and changing technological requirements (welding parameters, electrode diameter) and different mesh configurations account , According to the invention the problem is solved dadruch that the wire guide after the main feed consists of one or more Zugmodulen and variable-length cable pieces, all modules also have similar, mutually coupled central circuit connections and introduction or transmission elements for the electrode wire, the protective gas, the welding current and the oscillating armature voltage , In this case, the excitation coils of the train modules have a series diode whose direction of action or bridging according to the Förderbedingungon can be determined and the common power supply of all train modules via a symmetrical AC voltage with fixed or variable frequency.

Thus, due to the coupling and the operational capability of the train modules on different half-waves of the control voltage, previously unknown feed combinations can be constructed. Looking at the direct coupling of two train modules, there are two basic variants; With the same diode purity, both systems work in phase, which leads to a doubling of the feed force. With different diode polarity, the systems operate alternately, doubling the feed rate and average feed rate. For the choice of possible combinations and the spatial arrangement there are u. a. the following aspects:

when welding predominantly thick wires, it is preferable to work in phase at a predetermined voltage,

- When welding thin wires at high speeds and with elastic suspension an antiphase operation is meaningful, which suppressed, in particular, natural oscillations of the overall arrangement and reduced power losses.

By bridging or omitting the series diode works a single system with twice the frequency.

embodiment

In the following, the invention will be explained with reference to exemplary embodiments.

The following block diagrams serve as support (Figures 1-6). The pictures contain the same basic elements as burner 1, cable piece 3, tension modules 7; 8 and main feed 6.

Figs. 1 and 2 show a device with the burner 1, which is fixed by means of clamping prism 2 to any Bowegungsmaschine. The cable piece 3 connects the burner 1 with a tandem device from the train modules 7 and 8, which in turn are connected via a longer length of cable 9 with the main feed 6 in connection. Like the burner 1, the tension module 7 is held by means of a tension prism 10.

The train modules 7 and 8 work in phase opposition. The exciter coils of the train modules used in each case contain a series diode 11, which comes into effect according to the required technological conditions or can be bridged.

3 shows a simple coupling of the tension module 7 with the burner 1. The attachment of the tension module 7 on the musculoskeletal system takes place indirectly via the burner 1 on the clamping prism. 2

Analogously to FIG. 1, the coupling to the main feed 6 takes place via the cable piece 9.

A possible circuit arrangement is shown in FIG.

In complicated installations, Figure 5, of cable piece 3, it is necessary to produce high shear forces. For this purpose, a Gleichschaltung two train modules 8, wherein one is rigidly coupled to the burner 1 and the second is held by a clamping prism 10.

Fig. 6 shows the associated circuit arrangement.

Claims (1)

Pull-pressure wire feed device for the MIG / MAG welding using a controlled shear drive in combination with Schwingankerzugmodulen, the wire guide after the main feed of one or more train modules, as well as variable-length cable pieces and all modules also similar, interconnectable central terminal connections and introduction or transmission elements for the electrode wire, the protective gas, the welding current and the oscillating armature control voltage, characterized in that the excitation coils of the tension modules (7; 8) have a series diode (11) whose direction of effect or bridging can be fixed according to the conveying conditions and the common power supply of all the train modules (7; 8 ) via a symmetrical AC voltage with a fixed or variable frequency. For this 3 pages drawings Field of application of the invention The invention relates to a device for feeding welding wire during welding with consumable electrode or filler wire. Characteristic of the known state of the art Various systems are known for generating pulsating advancing movements of the electrode wire in MIG / MAG welding. DD-PS 127603 proposes a motor swash plate arrangement with self-locking driver systems. Although such solutions are quite powerful through the use of DC motors, they do not permit independent adjustment of feed rate and feed rate and are not flexible in terms of process adaptation. This disadvantage is to eliminate a solution according to DD-PS 131625, which provides for the use of oscillating systems with an independent setting of vibration amplitude and frequency. In this case, the stabilization of the welding current average should be done by regulating the amplitude. According to DD-PS 134 334 the use of two or more such feed systems is proposed, with a differentiated adjustment of the individual modules when supplied by a common amplifier unit to ensure safe operation even with changing acceleration and load conditions. These solutions, which provide only oscillating systems for generating the feed movement of the electrode wire, has in common that without a real control z. B. dss welding current, no stable operation, d. H. no reproducible specification of the welding parameters is possible. The averaging of the actual value required for a regulation always leads to limitations of the dynamic control parameters and to a limitation of achievable feed forces in the case of short-circuited material transfer. In addition, each system requires a separate supply or on-site balancing. The proposal according to DD-PS 138614 provides for the combination of two pulsating systems and already points to the possibility of a time offset by 180 ° excitement. However, the same restrictions apply here as in the two preceding patents. Therefore, according to DD-PS 157683, the combination of conventional, continuous and pulsating drives proposed, with a train-pressure system is formed. The continuous sliding system ensures the essential part of the required thrust as well as the constancy and reproducibility of the average feed rate. The pulsating traction drive, however, ensures a tightening of the electrode wire in the guide channel, thus eliminating the so-called "slip-stick" effect, causes the control of Abschmelzcharakters and adapts with the amplitude always specified by the shear drive speed, which makes fault-prone regulations superfluous. Restricting to only one traction drive is disadvantageous in complicated course of the wire guiding system (robotics) and does not exhaust the possibilities of the feed combination. DD-PS 134334) contradicts the dominant here Grunogadanken for uncomplicated solutions without adjustment and adjustment and can not be easily transferred to the train-pressure system with classic thrust drive. Object of the invention It is an object of the invention to improve the wire transport in terms of reliability in the welding area with little technical effort for different requirements in MIG / MAG welding and thus to increase the productivity of the equipment equipped with it.