SU63293A1 - Electric arc welding method - Google Patents

Description

Modern methods of automatic welding, which have a number of advantages over manual welding, have disadvantages that reduce their efficiency or limit their use. Thus, automatic heads (both constant and alternating current) are very capricious in operation, complex in the electrical circuit, require special devices in the form of machine tools, etc., and therefore can be used in large workshops. length. Union-Melt automatic welding (at the Institute of Electric Welding of the Ukrainian Academy of Sciences), which requires a complex installation, a special portal, long-term development, as well as significant power consumption, can be used only in workshop conditions also at a limited length. Automatic welding according to the Elia-Gafergut method (aBiaipKai by a closed recumbent electrode) is very easy to learn, however, it is limited to welding straight linear shvov not more than 1300 mm long, since with a longer length the electrode heats up to heat and welding in this area is not carried out .

The present invention pursues the following objectives: 1) the improvement of the efficient use of the electric power of welding machines due to the relative reduction of the resistance of the welding circuit; 2) the creation of more favorable conditions for the exploitation of welding machines by establishing a constant voltage drop both on the arc and on the electrode, which will increase the equipment's service life; 3) welding of long (10-12 m and more) welds without interruption in work in one working operation, which greatly reduces the auxiliary time; 4) implementation of welding of molded and curved-line shvvi both in the conditions of the workshop (installation) and in the field conditions; 5) the implementation of process automation and the possibility of combining the work of two or three plants with one welder - a low qualification service technician (3-4 times).

These goals are achieved by the fact that when a flat electrode is welded according to the invention, current is applied to the recumbent electrode by means of a moving contact, which is moved along the electrode, respectively, by moving the arc along the seam so that during the welding process .

The invention is illustrated by drawing, nai fig. 1, which shows the layout of the electrode and the moving contact during welding according to the proposed method; FIG. 2 and 3 are schematically depicted in two projections (side view and top view) an automatic machine for welding production, but we propose a long way and in FIG. 4 - receiver with a visor (in perspective).

As shown in FIG. 1, the welding arc 1 is lit between the product 2 and the end of the recumbent electrode 3; there is an insulation layer (paper, flux) between the latter and the product. The current to electrode 3 is supplied by means of a movable crane 4 (contact roller) moved along electrode 3 as it is burned so that the distance between contact 4 and arc 1 remains constant 1 const. The current to product 2 and to terminal 4 is supplied by wires 5 and 6.

Automatic (Fig. 2-3) consists of the following main parts:

7- round shtanga guide on two hinged supports; 3 - motor with a drum (type

small winch); 9 - traverse with a joint and two sliders I;

 10 - a holder with a contact roller 4; 12 - yoke with guide roller 13;

And - hopper for granulated flux with flux regulator torol1; 15 - receiver with a visor; 16 - drum for coiling welding wire;

17 - drum for winding insulator.

The clips 10 and 12 form a hopper carriage and drums.

The guide 7 establishes the house with the welded part 2 according to the direction of welding depending on the conditions, the guide can be put directly on the part). Travers with POWZunami are worn on the guide. The contact roller and the product are connected to a welding current source. A coil is worn on the drum 16 from the rust of the welding wire. A paper tape soaked in liquid glass or some other insulator is put on a second (small) drum 17. The tape is passed under the | Pravlyuschim p contact roller, then the welding wire is also passed; the tape and wire are aligned on the part or in the groove. Granular flux is poured into the bunker, which is strictly calculated to be fed to the receiver 15 during the traverse movement. The yoke is connected to the winch by cable 18; if the outlines of the schV are curvilinear, then it is necessary to skip the cable on the used legs at turning points. In this case, the guide must have curvilinear outlines. After that, the machine is ready to work.

As soon as the adjustment is completed, the welding current and the breaker of the motor 8 turn on. The motor, turning the winch, begins to choose the cable to itself and, consequently, there is no sweat for the traverse. After the contact roller moves away from the end of the welding wire to a distance of 1 100-150 MM (maximum 200 m.m), and at this distance, the flux covering the electrode is equal and strictly equal in height to the electrode (height adjustment carries out the receiver's visor), the welder closes the end of the electrode with a part with a square or a metal rod, and this itself (initiates an arc between the electrode SM and the product.

A prerequisite is the synchronization of the movement of the roller and the burning arc. In this case, throughout the process, a constant voltage drop across the electrode and on the arc is obtained, since the arc length and the electrode length over which the welding current flows, remain constant. This last circumstance will significantly improve

The conditions of electrical welding equipment will accelerate the welding process. The inventor claims that the electrode burning rate in this case will be higher than the burning rate of the iri electrode to welding by the Elin-Gäfergut method in the development of the Mytishchi plant.

Subject invention

Claims (3)

1. The electric arc recumbency electrode method, that is, that the current is supplied to the latter by the HELP a movable contact that moves along an electrode according to the movement of the arc along seam, in order to maintain a constant voltage drop across the electrode. 2. Acceptance of the removal method according to p. I, which means that, in order to carry out the continuity of the welding process, wire used from the drum and laid into the slots under the moving contact is used as the welding electrode. 3. A device for implementing the method p. 1, 2, from that with the fact that the MOVING contact with the guide roller, drum and hopper for the flux is rigidly fixed on the carriage, which is still erected along the weld seam. To the author's certificate number 63293 - four - FIG. 3