Device for arc multielectrode welding

 

(57) Abstract:

The device can be used for welding corner joints of rectangular tubes. Protective camera posted by the weld head from several blocks of electrodes, sequentially mounted on brackets in the General elds of application. The blocks are electrically connected and fixed on a stand-alone product the clamp using consoles can be rotated relative to them. The number of blocks equals the number of joints of the parts to be welded head. The number of electrodes in each block is selected depending on the required length of the seam and the diameter of the point to be welded to one electrode per cycle. Against the working ends of the electrodes are located the ends of the cores of the solenoids, mounted in a common holder and connected to the source of their power through the device software of the switching current. The proposed device can improve performance and simplify the design of the equipment due to the lack of necessary isolation of the electrodes and blocks from each other, as well as the lack of separate leads to each electrode. 4 Il.

The invention relates to mechanical engineering and can be used, for example, fujimura Harosi, Inoue, Hironori, application N 63313674, Japan, from 21.12.88,, R j 1.63.263 P, 1990), according to which welding perform several consumable electrodes with the formation of a common bath. Wire each electrode served by individual mechanism through a copper current-carrying tube. All tubes are collected in the beam and electrically isolated from each other. The power of each electrode is produced independently from a separate current source. In the middle of the beam, not reaching the lower end of the supply circuit through the same tube serves a protective gas. The entire Assembly of tubes is placed in a surrounding nozzle to form a stream of gas that protects the weld pool from the air. The result is high performance welding process, improves weld formation and reduced the consumption of protective gas. But there is a method complicates the equipment due to the need for Autonomous power supply of each electrode from a separate power source.

There is also known a method multielectrode arc welding (Kazakov, Y. C., A. Akimov Century, USSR author's certificate N 1779504 from 02.01.91 year), according to which to perform the welding mainly of thin-sheet structures by multiple electrodes. The welding voltage is simultaneously the RCA is conducted according to a given program. To do this consistently ignite an arc on another electrode by disabling it transverse magnetic field. When welding by this method through the use of multiple electrically interconnected electrodes and ignition control of the arc by switching low-voltage circuits simplifies the design of the welding head and saves energy. However, this method for welding short seams, such as truss structures of rectangular cross-section tubes, require moving the electrodes after each welding seam on the new section of the joint parts and re-configuration of the electrodes on the joint. This increases the complexity of the welding process.

The known method and device for arc welding (Henry Thomas Leiby, patent N 3114829, USA from 17.12.1963 g), which is taken as a prototype. In this way the welding are several non-consumable electrodes, which have consistently along the welded joint. The electrodes are alternately included in the welding circuit. Each electrode performs welding one point that overlap each other. To protect metal weld pool from the front and from the back side of the joint apply chamber filled with protective gas. This method allows increasing stvie, each electrode should be provided with a separate power cable, electrodes need to be isolated from each other and the device must be equipped with a power switch of the welding current. In addition, when welding short seams frame designs, for example of rectangular pipes, the device according to the prototype as well as previous similar, will require frequent shifts of electrodes and re-configure them on the new joint parts, which will increase the complexity of the welding process.

The technical problem to be solved by the proposed device, the simplification of the equipment and improving the performance of the welding process.

The proposed device has a security camera installed in her welding head containing several series set nonconsumable electrodes fixed in the elds of application and connected to a common power source of the welding arc. Unlike the prototype welding head consists of several blocks of welding electrodes, electrically connected to each other. Blocks fixed on a stand-alone from a welded product the clamp using consoles can be rotated relative to them and provided with brackets for mounting the electrodes in ookoi. The number of electrodes in each block is determined from the expression

< / BR>
where L is the length of the seam, performed by this unit, mm;

dm- diameter point, welded one electrode for the cycle.

Each electrode is provided with a solenoid, the end face of the core which is against the working end of the electrode. The solenoids are enshrined in the common holders and connected to the source of their power through the device software of the switching current.

This set of new features with the known will improve the performance of the welding process designs with a large number of short welded joints due to the fact that will provide the opportunity to automate this process. In turn, this capability will be provided to simplify the design of the device due to the fact that become unnecessary contact to each electrode and eliminates the need for switching high-current circuits.

The device illustrated in the drawings. In Fig. 1 shows a diagram of the device of Fig. 2 is a front view; Fig. 3 is a top view; Fig. 4 is a left side view of the welding head.

The proposed device contains protective camera 1 installed in her welding head, consisting of several the power 3 of the welding arc. Blocks 2 electrodes 13 are electrically connected and fixed on a stand-alone from a welded product the yoke 5 by means of consoles 6,7,8 and 9 can be rotated relative to them. The electrodes 13 are enshrined in the General elds of application 11 by brackets 10. Each electrode 13 is provided by the solenoid 12, the end face of the core of each solenoid 12 is located against the working end of the electrode 13. The solenoid 12 is fixed in the General solenoidoperated 14 and is connected to the source 15 of their power through the device 4 software switching current. The number of blocks 2 is chosen equal to the number of joints in the joint parts welded node 16, a welded head. The number of electrodes 13 in each block 2 is determined from the expression

< / BR>
where L is the length of the seam, performed by this unit, mm;

dm- the diameter of the point to be welded to one electrode per one cycle of its operation.

The proposed device operates as follows. On Shrivenham node 16, for example T-shaped junction of two pipes of rectangular cross section, establish and fix isolated from node 16 to the clamp 5. When using consoles 6,7,8 and 9 fixed units 2 installed in series with a consumable, such as tungsten, electrode 13. The number 16. The number of electrodes 13 in each block 2 is determined from the expression

< / BR>
where L is the length of the seam, performed by this unit, mm;

dm- the diameter of the point to be welded to one electrode per one cycle of its operation.

The choice of the limit of the ratio in the denominator of this expression is due to the fact that when it is less than 0.4 on the reverse side of the seam will not overlap points, welded to each of the electrodes 13, and a value of more than 0.8 points will be almost completely re-molded, which reduces the efficiency of the process. In both cases, will decrease the quality of welds.

In blocks 2 electrodes 13 are enshrined in the General elds of application 11 by brackets 10 and connected to a common power source 3 of the welding arc, the other pole of which is connected to being welded to the node 16. All electrodes 13 provided with a solenoid 12, the ends of the cores which have working against the ends of the electrodes 13. The solenoid 12 is fixed in the General solenoidoperated 14 and connected to a separate power source through the device 4 software switching current. Blocks 2 is fixed on the consoles 6,7,8 and 9 can be rotated relative to them, which allows you to set the electrode 13 at an acute angle to the surface with the beam joint (Fig. 4). Top assembled from blocks 2 welding heads install a protective chamber 1, which can be used any camera of known construction, such as hard Luggage of two halves that are fitted with seals in the connector and along the perimeter of the covered parts, fittings for the supply of the protective gas and the output power and the switching wires. The chamber 1 is filled, for example, by purging with inert gas, which can be taken argon. The voltage from the power source 3 arc serves simultaneously to all electrodes 13 all the blocks 2 are electrically connected to each other. At the same time through the device 4 software switching current serves voltage from the power source 15 for all the solenoids 12, which generate transverse relative to the axis of the electrodes 13 a magnetic field that prevents the ignition of the welding arc. The device is shown in its original state before welding.

The welding process begins, tearing through the device 4 software switching power supply circuit of one of the solenoids 12. Against the working end of the respective electrode 13 will stop the influence of a transverse magnetic field between the end face of the electrode and the surface being welded is not to be energized from the power source 15. During arcing under the electrode 13 is formed welded dot diameter dm. Then the device 4 according to a given program applies a voltage from the power source 15 to the solenoid 12 and turn it off on another solenoid 12. The cycle will be repeated until then, until you form a weld point under the last of the electrodes 13 each block 2. Point mutually overlap forming a continuous weld seam. Welding can be carried out without additives or filler material, pre-Packed in the joint parts. As the device 4 soft switch current can be applied to any known switch, assembled, for example, from commercially available stepper seekers. Such a switching device can provide any sequence of excitation of the arcs from the electrodes 13, which will reduce the voltage at the welding site 16.

The proposed device is compared with the prototype has a more simple construction, since it does not require connecting a separate power leads to each electrode and does not require isolation of the electrodes 13 and 2 blocks from each other. Switching the ignition arc across the electrodes 13 is in the low voltage circuits of the solenoids 12, which simplifies the design of the device 4 commutation parts welded node 16, its functions will be to only install the blocks 2 welding heads and protective camera 1 on welded joints of parts and removing them after welding. These operations it can perform on some joints parts at a time when other joints is welding. The result will increase the productivity of the process.

Thus, the proposed device provides a technical effect and can be constructed and applied using means known in the art. Therefore, the proposed device for arc multielectrode welding has industrial applicability.

Device for arc multielectrode welding containing protective camera installed in her welding head with multiple sequentially fixed in the elds of application with non-consumable electrodes connected to a common power source arc welding, wherein the welding head consists of several blocks of welding electrodes connected electrically with each other, the blocks are fixed on a stand-alone from a welded product the clamp using consoles can be rotated relative to them and provided with brackets for mounting the electrodes in General electrodata electrodes in each block is determined from the expression

< / BR>
where L is the length of the seam produced by the unit, mm;

dm- the diameter of the point to be welded to one electrode per cycle,

each electrode is equipped with a solenoid, the end face of the core which is against the working end of the electrode, and the solenoids are enshrined in the common holders and connected to the source of their power through the device software of the switching current.

 

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