SU841851A1 - Current leading tip - Google Patents

Description

(54) CURRENT SUPPLY

one

The invention relates to mechanical engineering and can be used to create a sliding contact in electrical devices, mainly in devices for automatic arc welding with a melting electrode.

Mouthpieces made of copper and its alloys with a straight and curved channel for guiding the melting electrode l are known, as well as mouthpieces with a pressure roller, in which rollers 23 turn as the channel wears out.

Under the conditions of mass production, welding machines use mouthpieces with a straight cylindrical channel. In order to provide sliding contact between the electrode wire and the walls, the direction of the channel of the mouthpiece channel should be the diameter of the channel of the mouthpiece should be greater than the diameter of the wire. This leads to instability of the electrical contact between the electrode and the mouthpiece and

affects change

departure electrode.

However, with a change in the length of the overhang of the electrode, its electrical resistance also changes, and thus.

resistance of the circuit at the site of the electrode part. This leads to a change in the welding mode, to a change in the nature of the transfer of the electrode metal and, consequently, to a change in the formation of the weld.

Closest to the present invention, there is a current-supplying torch head for welding with a melting electrode, comprising a housing with a current-carrying tip, as well as a direct current electromagnet for generating a pressing force of the melting electrode to the current-supplying tip. The yoke of the electromagnet is mounted on the body, and the pole pieces are bent toward the GZD melting electrode

However, the known device has

significant drawbacks in the principle of its device, thanks to which it can not find practical application in arc welding. The ends of the electromagnet poles are located below

current-carrying tip. On the point of departure of the pdtav of the right electrode. These poles of magnetite should be applied to the electrode and attract it to the surface of the internal channel of the current lead - .:

Claims (3)

tip to improve the electrical contact between the current tip and the electrode. In practice, this cannot be done, since the amount of the overhang of the electrode is 8-12 mm. The poles e; electr of the magnet, located on this site, under the action of the heat of the arc, are melted and welded to: the electrode and the part to be welded. PLEASE MO of that heating arc. The material of the electromagnet poles leads to the loss of magnetic properties, and the force of the impact of gnit and electrode wire is reduced. Close proximity of the electromagnet poles to the welding arc causes their molten metal to splash. Spatter has a significant effect on welding quality. Ocoi especially affects arc welding in CC. Due to spattering, a metallic contact arises between the magnet pole and the current-carrying tip, which leads to double arcing. The arc is practically shining between the magnet pole and the part. Location on. The torch of the electromagnet near the weld to the workpiece hinders the technological approaches, for example, when welding thick materials or the weld to the corner. A great disadvantage of this device is the dependence of the wire clamping to the bushing channel. The magnetic field interacts with the current flowing through the conductor-electrically. This clamping force is unstable and it depends on the welding. This force is very small and cannot provide the clamping of the wire to the mouth of the mouthpiece. It is known that the magnitude of the current during welding varies depending on the conductance and the arc column. Currently, pulsed welding and modulated-current welding processes are used when the amplitude values of the current during welding vary by 20-60% with a frequency of 50-100 Hz, and in other cases with a frequency of 0.5-5 Hz. Obviously, with this mode of power arc arc ele | The electrode wire vibrates between the poles, the electromagnet with the frequency of current changes, the contact with the die changes, and the welding process is unstable. The purpose of the invention is to increase the service life of the mouthpiece, improve its ease of operation, improve the quality of welds and provide welding with a pulsed or modulated current. . l, -,. This goal is achieved by the fact that in a current lead tunnel, containing a housing with a current lead tip, and a magnet to create a pressing force on a melting electrode to a current lead tip, mounted on the case, the magnet is fitted with a skin made of worn on the current lead the tip of the sleeve with a tapered end / located on the side of the working end of the mouthpiece, and the current lead tip is made in the form of a split Collet. The yoke of the magnet is installed with the possibility of adjusting its position along the axis of the mouthpiece. FIG. 1 shows the proposed mouthpiece, a general view; in fig. 2 and 3 variants of the current lead, made in the form of split collet j in FIG. 4 - section AA. figure 1. The current lead mouthpiece includes a body 1 with a current lead tip 2 screwed into it, made in the form of a split collet (Figures 2 and 3). The current-carrying mouthpiece has a magnet for creating a pressing force of the melting electrode to the current-carrying tip 2, which contains a rm 3 mounted on the housing 1. The yoke 3 is attached to the housing 1 by a screw 4, which allows the position of the frame 3 on the housing 1 to be adjusted. and measles 5, made in the form of a sleeve with a conical end b, worn on the current-feeding tip 2. The conical end b of the core 5 is located on the side of the working end of the mouthpiece. Due to the attraction of the core 5 to the om 3 the measles 5, which is a sleeve with a conical end b, is moved relative to the body 1 of the mouthpiece, it compresses the current supplying tip 2, made in the form of a split collet, thanks to which the guide channel in the current end tip 2 is narrowed and the contact between the melting electrode and the current lead tip 2 is improved. Extent: The constriction is adjusted by changing the gap between the rome 3 and the core 5 (using screw 4), changing the angle of the conical end 6 of the core 5 and the split collet, and also second magnetic field strength. The proposed design of the current-carrying mouthpiece allows to stabilize and improve the sliding contact between the melting electrode and the current-carrying tip, which results in an improvement in the quality of welded joints in automatic welding, as well as: increase the service life of the mouthpiece, improve its usability and ensure welding pulsed and modulated current. Claim 1. Current-carrying mouthpiece, containing body with current-carrying tip, as well as magnet for creating pressure to apply a melting electrode to. Current-carrying tip, having a shim mounted on the body, characterized in that, in order to increase the service life of the mouthpiece, improving the convenience of its operation, improving the quality of welds and providing welding with pulsed or irradiated current, the ViarHHT is equipped with a core, made in the form of a sleeve with a tapered end, nym from the working end of the mouthpiece, and the current-supplying conductive tip is formed as a slotted tsangi.- 2. The current-carrying mouthpiece according to claim 1, characterized in that. That the rm is installed with the possibility of adjusting its position along the axis of the mouthpiece. Sources of information taken into account during the examination 1. Potapevskiy A.G. Welding in shielded gases with a fusible electrode. M., Mechanical Engineering, p. 199, Fig.75. 2. Khrenov K.K., Nazarov S.T. | automatic arc welding. M., Mashgiz, 1949, p. 154. 3. Copyright certificate CGCP 490596, cl. At 23 K 9/16, 10.09.79. Fi.2. Bv li ф.З A-l