SU1174207A1 - Torch for gas-shielded arc welding - Google Patents

Abstract

1. BURNING FOR ARC WELDING IN PROTECTIVE GAS, containing a current-carrying tube, a nozzle for supplying protective gas, a suction nozzle connected to an ejector pump having a mixing chamber and a receiving chamber, inside which is located a working nozzle connected to the tube for supplying working gas as well as a current-carrying cable, characterized in that, in order to increase convenience in operation and reduce the flow rate of the working gas, the longitudinal axis of the mixing chamber is located relative to the longitudinal axis of the current-supplying tube at a distance of .tR1 C J is the apparent radius of the camera body where it is mixed; Ryp is the outer radius of the current lead tube. 2. The burner according to claim 1, dividing p. in that the tube for supplying the working gas and the body of the mixing chamber are made of (L of electrically conductive material and connected electrically to the current-carrying tube, and the current-carrying cable is located inside the tube for supplying the working gas.

Description

The invention relates to welding and can be used with semi-automatic. shielded gas welding.

The purpose of the invention is to improve ease of operation and reduce the consumption of the working gas.

The goal is achieved by the fact that in a gas-shielded arc welding torch containing a current-supplying tube, a nozzle for supplying protective gas, a suction nozzle connected to a shear pump having a mixing chamber and a receiving chamber, inside which is located a working nozzle connected to supplying the working gas, as well as the current lead cable, the longitudinal axis of the mixing chamber is located relative to the longitudinal axis of the current lead tube at a distance

, tR, p,

where RK is the outer radius of the camera body

mix;

fu is the outer radius of the current lead tube.

In addition, the working gas supply tube and the displacement chamber body are made of electrically conductive material and are connected by an electrically conductive connection to the current-carrying tube, and the power-supply cable is located inside the tube for supplying the working gas.

FIG. 1 shows a burner, a general view; in fig. 2 - cut. A-A in FIG. one; in fig. 3 section bb in fig. one; in fig. 4 is a section bb In figure 1.

A welding torch contains elements of a conventional torch for gas-shielded welding, including a current-carrying tube 1 and a gas-jet shield nozzle 2, a nozzle 3 for suction of aerosols with a nozzle 4, to which a sleeve 5 of electrically insulating material is connected together with a tube 7 and a working nozzle 8 at its end of an ejector pump. The cavity 9 with the nozzle 4 and the nozzle 3 forms the receiving chamber, and the cavity 10 forms the displacement chamber of the ejector pump.

The longitudinal axis of the displacement chamber 10 is offset with respect to the longitudinal axis of the current-carrying tube 1

,

where RK is the outer radius of the mixing chamber RTO is the outer radius of the current-carrying tube,

for example, downwards, and the housing 6 of the mixing chamber 10 and the tube 7 for supplying the working gas to the working nozzle 8 are made of an electrically conductive material and connected to the current supply tube 1 by an electrically conductive connection 11.

The housing 6 of the pump displacement chamber (cavity 10) through a sleeve 12 made of electrically insulating material is connected to an azorolesol discharge hose 13 made, for example, of flexible metal hose of the RZCH-3 type, which is placed inside a canvas fabric cover (cover not shown).

Tube 7 is connected to a lead-in cable 14, which extends inside tube 15, for example, from silicone rubber enclosed in a sheath of metal hose 16. Tube 15 and metal hose 16 form a hose through which compressed working gas, for example air, is supplied to an ejector pump, An electrical current is applied to the burner. For this, the hose is connected to a nozzle, to which electric current is supplied through the current lead 17, and through the nozzle 18 - compressed air. . The burner works as follows. Compressed air (working gas) from the compressed air line through pipe 18 passes inside the tubes 15 and 7 and j exits the nozzle 8 into the displacement chamber 10, ejects air from the cavity 9, which creates a discharge in the gap between the nozzle 2 and the nozzle 3 And to suction aerosol. Compressed air, the passage in the tube 15 together with the cable 14 cools it, which allows reducing the cable cross section, and mixing in the cavity 9 with a hot aerosol cools the aerosol, which reduces the heating of the burner and increases its ease of use.

The advantage of the proposed burner compared with the known one is that the location of the ejector pump is separate. A housing offset from the torch's current lead tube allows an increase in the efficiency of the ejector, since, due to the displacement of the mixing chamber relative to the current lead of the burner, it is possible to perform a longer mixing chamber.

In addition, the proposed burner reduces the consumption of compressed air. Thus, it has been established experimentally that with respect to welding with a wire of 2 m diameter in a carbon dioxide environment with a 450-500 A welding current, the ejector in a known torch must have a total hole area in the working nozzle equivalent to a nozzle with a diameter of 8 mm. With equal effectiveness of the aerosol, a nozzle with a hole diameter of 1.6-2.2 mm is sufficient. This allows a 3-4 times reduction in compressed air consumption.

In the proposed burner the hose for removal of aerosol is used with a diameter of 20-22 mm

(and in the known 33-35 mm), which significantly reduces the weight and rigidity of the hose. This, together with the cooling of the current lead with air, eliminates the need for

1Special parts for supplying current to the burner, convenient to operate.

The offered burner is simpler and cheaper to manufacture.

AA

Fig.Z

FIG L

Claims (2)

1. A torch for arc welding in protective gases, containing a current supply tube, a nozzle for supplying a protective gas, a suction nozzle connected to an ejector pump having a mixing chamber and a receiving chamber, inside which there is a working nozzle connected to the pipe for supplying working gas, and also a current-carrying cable, characterized in that, in order to increase convenience in operation and reduce the flow of working gas, the longitudinal axis of the mixing chamber is located relative to the longitudinal axis of the current supply tube R to t R γρ, where R _to - the outer radius of the housing of the mixing chamber; the outer radius of the power tube. 2. Burner pop. 1, different. the fact that the tube for supplying the working gas and the housing of the mixing chamber are made of electrically conductive material and are connected by an electrically conductive connection to the current supply tube, and the current supply cable is located inside the tube for supplying the working gas. 1 1174207 2