SU692706A1 - Nozzle to burners for arc welding - Google Patents

Description

one

The invention relates to welding equipment and can be used in electric arc welding machines.

Burner designs are known that include a mouthpiece with a guide channel for guiding the electrode wire and the contact tip 1.

In known constructions, contact tips are fixedly connected to the current lead. For example, the contact tips have an external thread, with which they are screwed into the contact piece. By means of a thread, unified cermet and carbide tips are attached.

However, in the known burner designs, during the welding process, electrical contact is made between a constantly moving electrode wire (melting electrode) and a fixed contact tip. As a result, an electric arc periodically arises between the contacting surfaces, which melts the electrode wire (melting electrode) in

place of contact. This causes the so-called sticking of the electrode wire (melting electrode) to the contact tip.

Sticking the electrode wire (melting electrode) to the contact tip slows down and stops it, at the exit of the burner. At the same time, the drive of the welding machine continues to feed the electrode 1wi wire (melting electrode) continuously, which ultimately leads to deformations; (see) it in the channel guide and deduces the last of the lines.

Sticking the electrode wire (melting electrode) and stopping it at the exit from the torch causes the arc to lengthen and go to the contact tip.

In those cases when tacking is fragile and the wire stiffness allows to transfer considerable forces, the cm of the electrode wire (melting electrode) does not occur in the guide channel, but its movement

It is more pristine, which leads to a deterioration in the quality of the weld.

iijeeci & iyajmryvrk gsch1 th welding with a melting electrode containing a contact tip for supplying current to the melting electrode (2. In this device, the mouthpiece is made of a current-carrying material, and the contact tip is mounted on the mouthpiece by pressing fit, and the wires will be attached to the wires of the wires. the soybean separates from the munshshuk and is transmitted by the transducer and is moved to the burning zone of the arc, therefore the contact tip is filled with melt.

However, when KOHtaKTHdrd is lost from the yundapuk, the arc does not break, the separation of the tip of the gnick serves as a visual signal for cBapiljHka to high welding current.

 Sflu arc for removing nshonechek from the mshdshtuk known device requires a special electrical circuit. ,

The purpose of the invention is to break the arc of the air of the floating electrode to the contact tip.

This is achieved by the fact that the topplug is installed on the mouthpuk in the contour of the tokopbdod with an ashm tip, the magnetic sleeve is made of insulating material, and the current-carrying ikoneadik is installed. with vbz-, ShShbtsh axial displacement regarding the said sleeve. ..

FIG. 1 shows the proposed rope with mouthpiece, longitudinal section (1 option); in fig. 2 is a section A-A in FIG. 1 (1 option); in fig. 3 - contact tip in perspective view (I variant); in fig. 4 torch with a mouthpiece, prodrlny cut (option 2); in fig. 5 - section А-А (2 variant); in fig. 6 - to: ontahtish gakonechnik in axonometry (option 2); in fig. 7 - torch with a mouthpiece, a longitudinal section (option 3); in fig. 8 - kbytaktny tip in axonometry (option 3); in fig. 9 - torch with MuntshtuM, longitudinal section (4th version); in fig. 10 - pin tip in perspective view (option 4).

The drawing is shown in several variants in the drawings. It contains mouthpiece 1, made of insulating material and has a channel for guiding the melting electrode 2. Current source tube 1 has a current-carrying tube 3 which is in contact with the current-providing tip 4. In the burner the nozzle 5 enters to form a flow of protective gas and a tube for supplying the impenetrable gas 6.

The contact tip 4 is made in the form of a split sleeve having an inner seating surface B of cylindrical shape, a through longitudinal slit C and a contact shoe G. Moreover, the landing tip 4 is mounted on the cylindrical end of the current-carrying sleeve 3, and the degree of compression of the sleeve 3 is cylindrical B of the contact tip 4 is adjusted by the degree of compression of the longitudinal slot B. The contact shoe G, which is six times higher

the area of the sleeve 3 makes permanent contact with the melting electrode and its contacting surface D can be formed by a slot in the base tube G (or pad).

The guide channel 2 may be lined with a spiral wound of bronze or steel wire (Figs. 1, 4 and 9). Insulated from the current-carrying sleeve 3, or insulating material (Fig. 8), for example, fluoroplastic or tubing.

FIG. 4 and 5 depict a burner having a contact tip 4 (Fig. 6), made in the form of a hollow glass, and, the outer cylindrical surface B contacts

with the inner surface of the central hole in the current-supporting sleeve 3, and the contact surface with the melting electrode is the hole D. Longitudinal slits B cnjoKaT to adjust the density of fit of the surface B inside the current-carrying sleeve 3.

  FIG. 7 shows a burner having a mouthpuk 1c with a contact tip 4 (FIG. 8), Lush filled with a ripple cup with

bottom in which hole is made

the passage of the melting electrode. On the insulated cylindrical surface of the current-carrying sleeve 3 (Fig. 7) of the Svbei, the inner surface B has a contact

At last 4. When the electrical contact is made between the current-carrying sleeve 3 and the contact, the HbiM tip 4 is made at the inner end of the split cup. The peculiarity of this variant is the break of the arc due to

the slightest axial displacement of the contact tip 4.

FIG. Figure 9 shows a burner having a contact mouthpiece 1 with a tip 4 (Fig. 10) in which the contact area with the current-conducting sleeve 3 is enlarged. Contact loader 4 (Fig. 10) is made in the form of a split cylinder with a collar G having h longitudinal grooves. The inner surface of the current lead of the neck of the sleeve 3 (Fig. 9) is insulated, and its bare end has ™ protrusion 1, is in contact with the end face and side slots of the collar of the collar G. The contact tip 4 (Fig. 10) is installed inside the insulator B, and the plane of contact with the melting electrode is an axial hole D of the corresponding diameter.

The floating electrode is fed by a feed drive to the arc burning zone along the guide channel 2 (Fig. 1) through the contact tip 4, in contact with its surface D (Fig. 3). At the moment of sticking the melting electrode to the surface D of the contact tip 4, the axial force generated by the feed electrode of the melting electrode is transmitted to the coaxial tip 4, overcoming the force of the pit and drops it from the current-carrying sleeve 3, thereby cutting the arc.

In addition to breaking during the sticking of the electrode wire to the contact tip and preventing deformation (sm) of the electrode wire in the cucumber channel, the device allows, subject to the use of a well-known control circuit of the welder's drive, to cut off the electrode wire.

The economic effect of introducing the proposed device into production is achieved by saving contact tips and improving the quality of welded joints.

Claims (2)

1. Potapievsky A.T. Welding in shielded gases with a fusible electrode. -M., Mechanical Engineering, 1974, p. 198-109. 2. US patent number 3103576, cl. 219-130, published. 1963 (npoTOTini). figure 1 Phi .2