RU2521948C1 - Flat nozzle of burner for argon-arc welding - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: flat nozzle includes a rectangular and all-metal nozzle tube with a wide front edge and with narrow lateral edges, on which longitudinal water-cooled channels are located. Supply and discharge holes of longitudinal water-cooled channels together with their supply and discharge connection pipes are located on the front wide edge of the nozzle tube. Cover plates are made in the form of solid rectangular plates and arranged on lateral edges of the nozzle.

EFFECT: arrangement of water supply and discharge holes with their corresponding supply and discharge connection pipes on front wide plane of the nozzle tube allows increasing cross section of water-cooled channels without increasing the cross section of the nozzle tube, which considerably reduces hydrodynamic head losses of the cooling system.

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Description

The invention relates to the field of welding production, in particular to arc welding by a non-consumable electrode in the environment of protective gases of various metals and alloys of increased thickness. The invention will find wide application in the performance of high-quality welded joints of α and pseudo α-titanium alloys using slotted grooves up to 200 mm deep on one side.

A device of a cylindrical nozzle of a torch for welding with a non-consumable electrode is known, which improves the efficiency of welding technology, increases the resistance of a tungsten electrode and improves the quality of the welded joint [1]. The burner is equipped with a water-cooled nozzle located in the lower part of its housing and separated from the housing by an electrical insulating sleeve. The cylindrical nozzle eliminates the filling of the slotted groove during argon-arc welding of thick-walled parts made of titanium α and pseudo α-alloys, since the diameter of the nozzle is much larger than the width of the slotted groove [2].

A device for a flat nozzle is known, for example, for manual argon-arc welding, which provides root passages and filling gap gaps when welding large thicknesses up to 200 mm on one side [3]. The nozzle is made in the form of an all-metal nozzle tube with a transverse rectangular section. The transverse dimension of the side face δ of the rectangular pipe is much smaller than the transverse size of the front face b, for example, δ = 0.322 * b. Such nozzle dimensions allow longitudinal channels to be provided on its lateral faces for circulation of coolant in them, for example, with dimensions (4 × 3) mm ² . A tungsten electrode is located in the inner cavity of the nozzle tube with a sufficient gap around the entire perimeter to supply argon, which protects the molten metal of the weld pool from the harmful effects of the air atmosphere. Cylindrical holes are made on the lateral face of the nozzle tube for supplying and discharging coolant using longitudinal channels. Into the cylindrical openings, the supply and outlet pipes are adequately installed for them. The most widespread are cylindrical nozzles with a diameter of d≥6 mm and an inner diameter of d≥4 mm, since the use of smaller diameters can significantly reduce the allowable heat load on the nozzle during argon-arc welding [4]. The main disadvantage of the known nozzle is that the nozzles are installed in holes located on the side narrow side of the nozzle tube with a thickness of b≤12 mm, since the maximum width of the narrow groove in the root of the seam does not exceed 14 mm [2]. Such a flat nozzle eliminates the use of water-cooling longitudinal channels with a large cross-section, which excludes intensive cooling of the flat nozzle, and, consequently, the use of forced argon-arc welding modes.

A device for a flat nozzle for automatic argon-arc welding without limiting the size of the nozzles used, including at d≥6 mm, which withstands the maximum heat load and is used in forced modes of automatic argon-arc welding [Drawing OSSP. 2901.000СБ Scientific Research and Design Institute of Power Engineering named after ON. Dollezhal (NIKIET)] (Appendix 1). Such a nozzle includes an all-metal nozzle tube with a transverse rectangular section, made in one piece with the head 1; L-shaped side cover 2, T-shaped side cover 3, outlet pipe 4 and inlet 5 with embossed heads 6. The transverse dimension of the side face of the nozzle pipe is 11.6 mm, the transverse frontal is 36 mm. Such dimensions of the nozzle tube allow longitudinal channels for coolant with a cross section (4 × 3) mm ² to be made on its lateral narrow faces. Covers 2 and 3 to the longitudinal channels of the coolant are hermetically connected to the side faces of the nozzle pipe using soldering. The nozzles 4 and 5 are placed at the level of the head along a plane coinciding with the plane of the lateral narrow face of the nozzle, where the width of this face is increased to a value that allows the installation of nozzles with diameters d≥6 mm. The outlet pipe 4 is placed on the head 1, and the inlet pipe 5 is placed on the horizontal shelf of the L-shaped cover 2. The use of figured caps 2 and 3 and the location of the pipes on different parts complicates the design of the nozzle, its manufacturing technology and increases the cost of expensive solder, and understated dimensions the cross section of the longitudinal channels increase the loss of hydrodynamic pressure in its cooling system.

By its technical nature and the achieved result, a flat nozzle for argon-arc welding [3] and according to the drawing ОССП 2901.000СБ (Appendix 1) is the closest to the proposal of the applicant and therefore is selected for the prototype.

The objective of the invention is the creation of a flat, water-cooled nozzle of a torch for automatic argon-arc welding with a non-consumable electrode, intended for widespread use in the performance of high-quality welded joints of various metals and alloys of increased thickness, including joints from α and pseudo α-titanium alloys using gap grooves up to 200 deep mm on one side.

The technical result that provides the solution of this problem is to increase the efficiency of the flat nozzle of the burner by reducing the loss of hydrodynamic pressure of its cooling system, simplifying the shape of the nozzle parts, the technology of its manufacture and assembly, as well as reducing the length of the joints made using soldering.

The above technical result is achieved as follows. In a flat nozzle of a torch for argon-arc welding, containing a rectangular all-metal nozzle tube with a wide front face and with narrow side ones, on which longitudinal water-cooling channels are located; the inlet and outlet holes of the longitudinal channels together with their inlet and outlet pipes are located on the frontal wide face of the nozzle tube, and the side covers are made in the form of solid rectangular plates.

The proposed nozzle of an argon arc burner has the following advantages.

1. The location of the water supply and outlet holes with their respective inlet and outlet pipes on the frontal wide plane of the nozzle tube allows you to increase the cross section of the water cooling channels, for example, up to (4 × 4) mm ² or more without increasing the cross section of the nozzle tube, which significantly reduces losses hydrodynamic pressure of the cooling system [5].

2. Replacing the L-shaped side cover with a hole and a solid T-shaped [3], [Appendix 1] with a pair of solid and simple rectangular caps simplifies the design of the flat nozzle of the burner and its manufacturing technology, and also reduces the length of the soldered joints.

The present invention provides a significant increase in the cooling intensity of the nozzle pipe of an argon-arc burner while simplifying the design of the nozzle, the technology of its manufacture and assembly, which improves the efficiency and quality of welded joints from α and pseudo α-titanium alloys using slotted grooves up to 200 mm deep on one side, as well as other high-strength metals and alloys.

The signs mentioned above are necessary and sufficient to achieve the above result, that is, they are significant. The presence of distinctive features in relation to the selected prototypes indicates the compliance of the claimed invention with the criterion of "novelty" under the current law.

The possibility of implementing the invention with obtaining the above technical result is illustrated by the drawings.

Figure 1 shows the inventive flat water-cooled nozzle of a torch for argon arc welding; figure 2 presents a view of the nozzle in section aa in figure 1; figure 3 presents an isometry of a flat nozzle.

Flat water-cooled nozzle of the burner contains a head 1, made in one piece with the all-metal rectangular nozzle tube 2; a pair of side covers 3; the front pipes 4 and 5, as well as the rear pipe 6 (Fig.1 and 2). On the left narrow side face of the nozzle tube 2 is located the front longitudinal channel 7, for example, the supply and rear 8 outlet. On the right side face of the tube 2 there is a front outlet channel 9 and a rear feed channel 10. Channels 7 and 8: 9 and 10 are sealed with corresponding side covers 3, for example, by soldering. On the front wide frontal face of the tube 2 are cylindrical holes; inlet 11 with its inlet pipe 4 and outgoing 12 with its outlet pipe 5, and holes are located on the rear face; outgoing 13 and incoming 14 with a common rear pipe 6. The connections of the pipes 4, 5, 6 are sealed with their mounting holes, for example, using soldering. Branch pipes 4, 5, 6; side covers 3; longitudinal channels 7, 8, 9, 10; the front 11, 12 and rear 13, 14 holes form a circulation cooling system for the flat nozzle.

Cooling the flat nozzle is as follows (Fig.2 and 3). Coolant from the supply pipe 4 through the front left hole 11 enters the longitudinal front channel 7, in the lower part of which the fluid flows into the longitudinal rear channel 8, from which it enters the arcuate pipe 6 from the left rear hole 13. Right pipe fluid 6 the hole 14 enters the rear longitudinal channel 10, at the bottom of which it flows into the longitudinal front channel 9, from which it enters the outlet pipe 5 through the front right hole 12, from which it exits the water cooler ayuschey system.

The non-consumable electrode 15 and the molten metal of the weld pool are protected from the harmful effects of the air atmosphere by supplying a protective gas, for example argon, to the internal cavity 16 of the nozzle tube 2. Figure 3 shows an isometric view of the nozzle according to the invention with the side covers 3. It is seen that the side the nozzle caps 3 according to the invention are simpler both the caps with a hole [3] and the shaped caps according to Appendix 1, which simplifies the design of the flat nozzle of the burner and its manufacturing technology, and also reduces the length of the soldered joints.

The table shows a comparison of the parameters of the prototypes and nozzles according to the invention.

The following notation is accepted in the table:

b is the width of the front face of the nozzle tube;

δ is the thickness of the side face of the nozzle tube;

h _d - loss of hydrodynamic pressure [5] in a dimensionless form.

The table shows that the nozzle according to the invention is superior to the prototypes in the compared parameters.

Thus, a flat nozzle of a torch for argon-arc welding with the best design and manufacturing and assembly technology is proposed, which ensures high-quality welded joints of various metals and alloys of increased thickness, including joints from α and pseudo α-titanium alloys using gap cuts up to 200 mm one side.

From the above it follows that the claimed nozzle according to the invention is aimed at solving the problem with the achievement of a new technical result and meets the requirements of patentability under current law.

Information sources

1. Astafiev A.G. Torch for welding with non-consumable immersed electrode. Patent RU No. 2 316 695 C1, IPC F23D 14/40. Op .: 10.02.2008. Bull. Number 4.

2. Kuznetsov S.V. et al. Welding and correction of defects in compounds of titanium alloys of large thicknesses by electron beam // Titan. 2009. No4. S.41, fig. 2.

3. Mikhailov V.I., Sakharov I.Yu. Welding of constructions from titanium alloys of large thicknesses (problems of technology). // Titan. 2006. No. 2, p. 51. fig. 2.

4. Atroshchenko V.V., Bychkov V.M., Medvedev A.Yu. Determination of permissible heat load on the cooling system of torches for argon-arc welding // Welding production. 2002. No. 11. S.9 - 11.

5. Heat and mass transfer. Thermal Engineering Experiment: Reference. Under the total. ed. V.A. Grigorieva and V. M. Zorin. - M .: Energoizdat, 1982. P.26. Formula 1.47.

Claims (1)

A flat water-cooled nozzle of an argon-arc welding torch, containing a rectangular all-metal nozzle tube with a wide front face and narrow side faces, on which longitudinal water-cooled channels are located, and covers, characterized in that the inlet and outlet holes of the longitudinal water-cooling channels together with their inlet and outlet the nozzles are located on the front wide face of the nozzle tube, and the covers are made in the form of continuous rectangular plates and are located on the side g anyah nozzle.

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