SU1181810A1 - Torch for arc welding - Google Patents

Abstract

ARM BURNER with a non-consumable electrode in shielding gases, comprising a housing, a nozzle fixed on it, a current-carrying holder of a floating electrode with helical grooves on the side, mounted on the housing; an insulation sleeve mounted on it, made with radial holes located at the gas supplying tube and communicating with its cavity, and forming its inner surface together with the outer surface of the holder, a communicating annular channel and screw channels for a protective gas passage, characterized in that, in order to improve arc stabilization, protect the electrode assembly from electrical double-arcing breakdown, the sleeve end, located at the working electrode end, is made with solid walls, on the inner surface of which 8 grooves are made, parallel to the axis the burners and cylindrical channels forming the outer surface of the holder, connected to the nozzle cavity and screw channels, and the sum S of the cross sections of the radial openings of the sleeve is equal to the sum of the cross sections eny cylindrical channels 00

Description

I1 The invention relates to arc welding, mainly to argon-arc welding with a non-consumable electrode. The aim of the invention is to improve the stabilization of the arc, to protect the electrode assembly from electrical breakdown when the arc is oscillating with an axle and to avoid double arcing. Fig. 1 shows a burner, a section in Fig. 2, an insulating sleeve, a section; figure 3 is the same cross section. The burner includes a housing 1, a current lead 2 located in the housing, and a current lead holder 3 with a non-optic copper electrode 4 with a tungsten insert 5. The holder 3 is fixed in the housing with a cap 6. The holder 3 is provided with helical grooves on its side; The surface of the holder 3 is installed with a gap relative to it insulating sleeve 7 ,. configured with radial holes 8 located at the gas supplying tube 9 and communicating with its cavity. Pipe 10 is intended .dl cooling water supply. In the burner there are rubber cuffs 11 for sealing gas and water channels. The isolator 1bone sleeve 7 forms with its inner surface together with the outer surface of the cores {atel 3 which connects the annular channel 12 and the helical channels 3 forming the swirling chamber. At the end of the insulating sleeve 7, located closer to the working end of the electrode A, grooves 14 are made. Grooves 14 are located on the inner surface of the insulating sleeve 7, parallel to the burner axis and form cylindrical channels with the surface of the holder 3, communicating with the nozzle cavity 15 and screw channels 13, the sum of the cross sections of the radial holes 8 is equal to the sum of the cross sections 1 of the cylindrical channels formed by the grooves 14 and the outer surface of the holder 3, This ratio is determined by the exp. 102,. rigorously. When the sum of the cross sections of the holes 8 of the greater sum of the cross sections of the cylindrical channels increases, the speed of the gas outflow from the screw channels 13, the arc protection deteriorates and atmospheric air leaks into the arc burning zone. When the sum of the cross sections of the openings 8 is smaller than the sum of the cross sections of the cylindrical channels at the exit of the channels, the gas is highly diluted and practically does not form a protective jacket around the arc. The length of cylindrical channels (8-8.5 mm) was determined experimentally. The burner works as follows. The arc and the electrode are excited by an oscillator with an oscillator. Gas is supplied to gas supply tube 9, which passes through the inlet openings 8 in insulating sleeve 7 and channel 12 located between insulating sleeve 7 and holder 3, enters the swirl chamber and twists through screw channels 13. After twisting, the gas flow extends through cylindrical channels, creates a dense protective jacket around the arc and stabilizes it. In the proposed burner, the possibility of double arcing by electrical breakdown between the nozzle 15 and the holder 3 is eliminated due to the design of sleeve 7. The insulating sleeve 7 (Fig. 2) of the proposed burner is provided with through holes only on the side of the inlet of the gas stream into the spin chamber located between the holder 3 and the insulating sleeve 7, and on the downstream side of the gas stream solid, in the proposed mount. The sleeve with channels is a screen between the elec- trode assembly and the nozzle and completely eliminates the possibility of electrical breakdown and the subsequent formation of a double arc. The application of the invention provides an increase in the lifetime of the electrode assembly and the nozzle.

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Claims (1)

ARC TIG BURNER with a nonconsumable electrode in shielding gases, comprising a housing, a nozzle mounted on it, located at. a housing a current-carrying holder of a non-consumable electrode with helical grooves on the outer surface, on which an insulating sleeve ^{1 is} mounted, made with radial holes located at the gas supply tube and communicating with its cavity, and forming its inner surface together with the outer surface of the holder communicating annular channel and screw channels for shielding gas passage, characterized in that, in order to improve arc stabilization, protect the electrode assembly from double electrical breakdown arc formation, the end of the sleeve located near the working end of the electrode is made with solid walls, on the inner surface of which grooves are made - 'parallel to the axis of the burner and forming cylindrical channels with the outer surface of the holder connected to the nozzle cavity and screw channels *, and the sum of the transverse the cross sections of the radial holes of the sleeve is equal to the sum of the cross sections of the cylindrical channels, SU-oo 1181810