SU1232417A1 - Torch for gas-shielded arc welding - Google Patents

Description

1232417

2. Burner pop, 1, characterized in that the swirler is made with the invention located on the invention. This invention relates to welding, in particular to electric arc welding with a melting electrode in a protective gas environment, and can be used in various areas of semi-automatic welding.

The aim of the invention is to increase the efficiency of gas extraction from the weld zone.

FIG. 1 shows the proposed burner, section; in fig. 2 is a view A of FIG. one; in fig. 3 is a flow chart of the flow of the protective gas and the gas-dust gaps to be removed.

The proposed burner comprises a handle 1 with a housing 2 located centrally, to which is connected a nozzle 3 for supplying a protective gas. In the center of the housing 2 there is an annular groove 4 in which a current-supplying tube 5 is placed, fixed in the base of the housing 2. The housing 2 is threadedly connected to the sleeve 6 into which the current lead-in plug 7 is screwed with the internal groove 8. Internal surfaces of the sleeve 6, the grooves 4 of the housing 2, the grooves 8 of the candle 7 and the outer surface of the current-carrying tube 5 form a channel 9 for the passage of protective gas connected to the pipe 3 through the opening 10 in the housing 2. At the base of the candle 7 there are holes 11 for the protective gas . In the head of the candle 7, a replaceable tip 12 is fixed with a central channel 13 for feeding welding wire. A nozzle 15 is fastened outside the sleeve 6 through the insulating conical sleeve 14, on the inner surface of which there are screw grooves 16 for curling the flow of protective gas. The inner surface of the nozzle 15 and the outer surface of the candle 7 form an annular channel 17 for supplying protective gas to the combustion zone of the welding arc.

To the handle 1 by means of a threaded joint concentric with the nozzle 15 of the suction nozzle prize, with a shoulder rigidly connected to the blades.

A nozzle 18 for suction of gas and dust emissions from the welding zone is fastened, the inner surface of which forms with the outer surface of the nozzle 15 a ring channel 19 for removing the hazards formed during the welding process. Between the slices' planes of nozzles 15 and 18, at the exit to the channel 19, an annular swirler 20 is placed, consisting

from curved blades 21, inclined at some angle to the axis of the burner. The inner straight edges of the blades 21 are attached to the sleeve 22 concentrically covering the nozzle 15,

and the upper edges - to the flange 23 connected to the sleeve 24. The sleeve 24 by means of a threaded connection is attached to the nozzle 18. The flange 23 has an annular conical groove 25 forming the peak 26. The outer curvilinear edges of the blades 21 form a truncated conical side surface with a convex curvilinear forming whose smaller base

combined with a nozzle cut 15, and more - with a nozzle cut 18.

The angle of inclination of the blades 21 ensures that the flow of gas-dust gaps is twisted in the direction opposite to the twisting of the protective gas flow, since the direction of inclination of the blades 21 is opposite to the direction of twisting of the helical grooves 16.

The burner works as follows.

The welding wire is passed through the tube 5 and the channel 13 of the tip 12 to the product. The protective gas through the pipe 3, the opening 10 and the channel 9 is fed to the holes 11. The exit from the holes 11, the protective gas enters the channel 17. As it passes through the channel 17, the source of the blocked gas is twisted using helical grooves 16, forming a vortex gas bell, expanding towards the weld zone. At the same time, in the weld zone, an upward flow of gas emissions is formed, which is formed in the form of

an aerosol bell expanding towards the handle 1. With the aid of pulling force (for example, an ejector or a vacuum pump) through the channel 19, the generated gas and dust emissions are sucked. At the same time, the flow of gas and dust emissions is twisted by the swirler 20 and the upper part of it leaks under the peak 26 of the collar 23.

In this way, two counter swirls are created; flow of protective and removable gases, which contributes to the increase in the aerodynamic stability of gas protection, reduction of the flow of protective gas and improvement of the quality of the weld.

The use of a swirler with a cone-shaped curvilinear lateral surface in the proposed burner, located between the cuts of the nozzles for supplying protective gas and removing gas emissions, makes it possible to increase the efficiency of removing the harmful substances.

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The geometrical aerodynamic parameters of such a swirler provide a steady pressure on the motion of the vortex flow of the upper, lower part of the aerosol bell to the suction zone. Such a swirler has a lower hydraulic resistance than the cylindrical shape used in the known device, and creates a more stable suction spectrum. This makes it possible to increase the removal efficiency of harmful substances at large welding wire escapes and disturbing influences of ambient air, to reduce the gas flow rate, which leads to a decrease in power to induce thrust in the system and, accordingly, to save electrical energy.

The technical and economic effect from the application of the proposed burner is to improve the sanitary and hygienic working conditions of the welder.

ViZK

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2

Compiled by G. Kvartalnova. Editor L. Gratilo Tehred G. Gerber Corrector M. Demchik

Order 2728/14 Circulation 1001Subscription

 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Fig.Z

Claims (2)

54) 1. BURNER. FOR ARC SAWARS IN THE ENVIRONMENT OF PROTECTIVE GASES, comprising an internal nozzle for supplying a protective gas with screw grooves on the inner surface, an external suction nozzle, and also a blade swirl, characterized in that, in order to increase the efficiency of extraction of dust and gas emissions from the welding zone, the outer edges of the swirl blades are made curved and arranged along a conical surface with a convex curved generatrix, the larger base of which is located at the exit of the aspiration nozzle, and the smaller warping - the slice nozzle for supplying a protective gas. S A yo 00 yo • m 2. Burner according to π. 1, characterized in that the swirl is made with a bead located near the suction nozzle and rigidly connected to the blades.