SU967716A1 - Apparatus for electric arc gas-shield welding by consumable electrode - Google Patents

Description

The invention relates to welding, in particular to arc welding with a melting electrode in shielding gases, and can be used in the structures of the nozzles of welding heads and torches for welding with a melting electrode with an increased reach.

A known mouthpiece for arc welding with an increased electrode overhang, containing a non-conducting insert with a through cylindrical channel I.

The disadvantage of this device is that when the cylindrical channel is worn in the non-conducting insert, the insert is replaced with a new one, i.e. the service life of the inserts is small, and the mouthpiece is designed to work with a certain amount of electrode overhang.

A die for arc welding is known, comprising a conductive plug with a through-square hole in its lower part, in which a replaceable tip is mounted in the disk. The disk is made split along the diameter of the flat plane and on each half on different sides of it, mutually perpendicular grooves are made to form a channel

for guiding the melting electrode 2.

In the known device, the service life of the tip is sufficiently increased, and in addition, the device is applicable only for welding with a normal overhang of the electrode.

The closest technical

10 of the essence and the achieved effect to the invention is a device for gas-shielded arc welding with a melting electrode with increased overhang, containing a current-carrying

15 the mouthpiece, on which a nozzle with an output channel and a non-conducting insert with a channel for guiding the electrode are installed through an insulating sleeve, the channel for guiding the electrode is made by a non-conducting BCTaBKie channel with a large cross section at the inlet, and its axis is offset from the channel mouthpiece 3.

25

A disadvantage of the known device is the inability to control the emission of the electrode, which leads to a decrease in the quality of welded

30 seams

The aim of the invention is to improve the quality of welds by adjusting the overhang of the electrode.

The goal is achieved by the fact that in a device for gas-shielded arc welding with a melting electrode with an extended overhang, containing a current-carrying mouthpiece, on which a nozzle with an outlet channel is installed through an insulating sleeve, as well as a non-conducting insert with a channel for guiding the electrode, the insert installed in the nozzle output channel, and the nozzle mounted for movement relative to the mouthpiece.

In addition, in order to increase the service life of the insert, it is made in the form of two rectangular plates with grooves forming channels for guiding the electrode located on opposite sides of each of the plates and with openings for the passage of protective gas.

In this case, the insert can be installed with the possibility of movement in the direction perpendicular to the longitudinal axis of the mouthpiece.

Figure 1 shows a device for arc welding, the section; in fig. 2 section aa in FIG. Fig. 3 shows a device with a number of pairs of grooves in the inserts, more than two, a cross section.

The arc welding device contains a mouthpiece 1 with a current-carrying tip 2, two inserts 3 and 4 of non-conducting material installed in the output channel of the conjta 5. The nozzle 5 is screwed onto the insulating sleeve 6 fixed on the mouthpiece 1. The nozzle 5 at the location Inserts 3 and 4 have a rectangular section and are rolled. The inserts are made in the form of rectangular plates.

On the inner 7 and outer 8 surfaces of the inserts 3 and 4 there are grooves 9 forming a cylindrical through channel 10 (figure 2) or channels 10 for guiding the electrode (figure 3). Inserts 3 and 4 can be installed in the nozzle 5 with a gap 11 between the inner surfaces 7, which is due to the fact that the height of the grooves 9 is less than half the diameter of the electrode wire (electrode) being fed. The mouthpiece 1 is made with (the channels 12 for gas supply, the inserts 3 and 4 also have the gas supply channels 13. The inserts 3 and 4 have bevels that create additional gas supply channels 14 when installed in the nozzle 5.

If there are more than two pairs of grooves 9 in inserts 3 and 4 (FIG. 3), these inserts 3 and 4 are fixed and moved in the direction perpendicular to the longitudinal axis of the mouthpiece 1 with screws 15.

Before operation, the electrode wire (electrode) is guided from the current-carrying tip 2. into the cylindrical channel 10 formed by the grooves 9 of the inserts 3 and 4 placed in the nozzle 5. The nozzle & screwed onto the insulating sleeve 6, mounted on the mouthpiece 1, until the inserts 3 and 4 are in contact with the current lead 2, the mouthpiece is ready for operation.

If it is necessary to increase the electrode wire outflow, the nozzle 5 is screwed from the insulating sleeve 6 by a certain amount and, thereby, the distance from the current-carrying tip 2 increases until the wire leaves the inserts 3 and 4.

When a pair of guide guides 9 are formed, forming channels 10, nozzle 5 is screwed out from mouthpiece 1, inserts 3 and 4 are removed from nozzle 5 and aligned with previously not working grooves 9 (Fig. 2 and 3) or move screws 15 together with inserts 3 and 4 in the nozzle 5 until the previously inactive channels 10 are aligned with the wire (electrode) feed direction (FIG. 3).

During operation, protective gas is supplied to the welding zone through channels 12 of the mouthpiece 1, channels 13 in inserts 3 and 4, grooves 9 and additional channels 14 ..

The arrangement in the device for arc welding in shielding gases with a melting electrode of the insert in the nozzle exit channel, as well as the installation of the nozzle c. the ability to move relative to the mouthpiece allows the quality of the welds to be improved by adjusting the overhang of the electrode without changing the linear dimensions of the inserts.

The insert is made in the form of two rectangular plates with grooves forming channels for guiding the electrode located on opposite sides of each plate and with openings for the passage of protective gas, and also that the insert is mounted for movement in the direction perpendicular to the longitudinal axis of the mouthpiece increases the service life of inserts.

Claims (3)

1. A device for gas-shielded arc welding with a fused electrode with an increased die, containing a current-carrying mouthpiece, on which a nozzle with an outlet channel is installed through an insulating sleeve, as well as a non-conductive insert with a channel for guiding the electrode, & to improve the quality of welded the seams by adjusting the electrode reach, the insert is installed in the output channel of the nozzle, and the nozzle is mounted for movement relative to the mouthpiece. 2, The apparatus of claim 1, wherein, in order to increase the service life of the insert, the insert is made in the form of two rectangular plates with grooves forming channels for guiding the electrode located on opposite sides of each of the plates, and with openings for the passage of protective gas. 3. The device according to claim 1, wherein the insert is mounted for movement in a direction perpendicular to the longitudinal axis of the mouthpiece. Sources of information taken into account in the examination -I. USSR author's certificate 582073, cl. At 23 K 9/00, 10.10.75. 2. USSR author's certificate W 579113, class B23 K 9/16, 10.21.75, 3. Authors' certificate of the USSR 650750, cl. B23 K 9/16, 03.08.77 (prototype). 12 I