SU1493414A1 - Torch for arc surfacing - Google Patents

Abstract

The invention relates to welding production and can be used in the surfacing and welding of steel and cast iron parts in hard-to-reach places, in particular, in the repair industry when restoring worn parts by welding. The purpose of the invention is to provide surfacing management in hard-to-reach places and improve the quality of surfacing. A torch for arc welding includes a housing 1 with an axial channel 2 for supplying oxygen, a single nozzle assembly 3 with radial channels in the outer nozzle for supplying natural gas, which are evenly circumferential and have the same diameter. The use of a single nozzle unit in the device 3 prevents the violation of the concentricity of the protective plume, which contributes to the stability of the welding bath. The implementation of the radial channels in the wall of the outer nozzle allows to form a protective torch, which provides high-quality overlaying of the reducing layers. 2 Il.

Description

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3The invention relates to welding production and can be used in the welding and welding of steel and cast-iron parts in hard-to-reach places, in particular in the repair industry during the repair of worn-out parts by welding "

The purpose of the invention is to provide surfacing management in hard-to-reach places and improve the quality of surfacing.

FIG. 1 is a schematic representation of the proposed burner, a vertical section; in fig. 2 - e; dyny nozzle unit, section

The burner consists of a housing 1 with a central channel 2, in which the following is installed on the thread: a single nozzle and a knot 3. There are five channels in the burner housing. Two i-is them serve to supply water to the rue. cooling and its removal (these channels are not shown). For central ry channel 2 oxygen is supplied to the internal nozzle of a single nozzle assembly. Natural gas is fed through the lower channel 4 to the outer nozzle of a single nozzle assembly. Upper channel.al 5 rumkit to guide the electrode. 6. The electrode deviates from the axis of the electrode channel and is directed to parts 7 by means of a current lead on the mouthpiece 8 mounted on the threads in the burner housing. The current lead on the mouthpiece allows the electrode to be tilted at the same time to supply the welding current to the electrode. The inner nozzles, the outer nozzles 9 and 10 are combined into a single nozzle unit 3 and are: in relation to the diameter of the inlet channel of the inner nozzle, the diameter of the exit channel on the roll nozzle and the distance between the nozzle sections as 1: (250 - 2.7 ); , (2,1 4,3), In the stenzse of the external nozzle there are radio-frequency channels; 1. For the supply of natural gas, the plane of location of the axis of which is removed from the cross section of the inner nozzle at a distance of 2.5 diameters of the channel 1I, the total cross-sectional area of the channels 11 S u and the cross-sectional area of the outer nozzle S КС , 07-0.18) 8. n; a and a cross-section of one channel 1

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S .. and their total area of the central cross sections S f ;.

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in the ratio S. 0.25S (f. Such ratios of the parameters of the radial channels 11 with the parameters of the outer nozzle JO provide a protective flame of the required shape and with the required characteristics. This ensures laminar flow of natural gas by a continuous ring flow at low speeds and the welding bath is stable .

The burner works as follows.

Oxygen is supplied through central channel 2 of housing 1, and combustible gas is supplied through lower channel 4. In a single nozzle 3, these gases move in separate streams: the central stream is oxygen; an external annular flow .- natural gas and directed to the welding zone or overlaying on the part 7. Simultaneously, the melting of the electrode 6 is fed through this channel 5. The flame of the flame protects the weld pool and the arc formed between the melted electrode 6 from the combustion of the combustible gas. and detail 7

The application of the proposed device makes it possible to expand the range of recoverable parts by arc welding with a weld pool with an annular flow of natural gas and a central flow.

g of oxygen due to the fact that the device allows surfacing both under normal conditions and in cramped conditions, such as surfacing the internal surfaces of small diameters. The use of a single nozzle unit in the device prevents the concentricity of the torch from being disturbed, which contributes to the stability of protection welding bath. The implementation of gas channels in the wall of the outer nozzle in the range of the above ratios allows to form a protective torch that provides high-quality welding of reducing layers

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Claims (1)

Invention Formula Arc welding torch, co. gg holdup current lead of the mouthpiece, body with an axial channel for supplying oxygen, and also concentric internal and external nozzles connected to the axial channel for supplying nature 5 1 gas, in which the diameter of the outlet channel of the inner nozzle, the diameter of the outlet channel of the outer nozzle and the distance between the nozzle sections are in a ratio of 1: (2.0-2.7):: (2.7-4.3), By the fact that, in order to ensure surfacing work in hard-to-reach places and quality of surfacing, the mouthpiece is installed in the burner housing, the inner and outer nozzles are combined into a single nozzle unit, while radial channels of the same diameter are made in the outer nozzle, which are evenly circumferentially nozzles and sums Arna cross-sectional area Sj, and the transverse area outer nozzle ratio n.-s found ofi4 (0.07 - 0.18) 8 cc, and the cross-sectional area of one channel is S. and the total cross-sectional area of the channels S is in the ratio S; 4 0,258 „5, the plane of the axes of the radial channels is located at a distance of 0.5-2.5 diameters of the radial channel from the shear of the internal nozzle.