SU1073034A1 - Torch for gas-shielded arc welding - Google Patents

Abstract

ARC WELD IN THE ENVIRONMENT OF PROTECTIVE GASES, containing a gas supply from a porous material, a housing and a contact element for supplying current to the electrode, characterized in that, in order to improve the quality of welds when welding with a non-molten electrode in hard-to-reach areas. gas and increase its laminar flow, the body is made with a cavity for the contact element, the body and the contact element are made of porous material, the porosity of which is 2-3 times less than the porosity of the material gas flow connection

Description

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The invention relates to welding production and can be used in welding critical structures in hard-to-reach places. The known shielded gas arc burner, comprising a housing in which the electrode holder and a gas flow tube with a filter are located to provide laminar flow of the protective gas 1. The disadvantages of this burner are low shielding gas heating at the exit of the rear nozzle, the complexity of manufacturing the housing the burner and the presence of a chamber in the housing to ensure the laminar flow, as when welding in hard-to-reach Places, a small change in the flow of protective gas leads to a breakdown of laminar flow eni The closest to the technical essence and the achieved effect to the proposed is a torch for arc welding with a melting electrode in a protective gas environment, containing a gas supply line of porous material, made in the form of a sleeve, forming a chamber for heating the gasification of liquefied CO2, body, on which is attached a nozzle supply of protective gas to the welding zone. The torch has a conductor and a mouthpiece with a contact element (contact tip) for applying current to electrode 2. However, this torch does not allow welding with a non-consumable electrode, as well as insufficient heating of the protective gas. Preheating of the gas is necessary to reduce the likelihood of pore formation, as well as to increase the laminarity of outflow of protective gas. Therefore, when welding in hard-to-reach places, insufficient heating of the solids gas can lead to poor quality welded welds. The purpose of the invention is to improve the quality of welds when welding with a non-consumable electrode in hard-to-reach places by heating the protective gas and increasing the laminarity of its flow. The goal is achieved by the fact that in a torch for arc welding in shielding gas containing a gas flow supply of porous material, the housing and the contact element for supplying current to the electrode, the housing is made with a cavity for the contact element, the housing and the contact element are made of porous material, the porosity of which is 2-3 times less than the porosity of the gas feed material. FIG. 1 shows a burner, a longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 - collet, longitudinal section; in fig. 5 - the same cross section. The burner includes a housing 1 on which a nozzle 2 is fixed. The housing 1 is made with a cavity in which the collet 3 is installed (a contact element for supplying current to the non-consumable electrode 4). The collet 3 is shaped (Figs. 3 and 4) to ensure better clamping of the electrode 4. The housing 1 and the collet 3 are made of a porous material. In the collet 3, the gas pipe 5, mounted inside the tubular insulator 6, is fixed at one end. The gas pipe 5 is fixed in the handle 7 by the second end. The tubular insulator 6 is fastened in the handle 7 by means of a spring 8 and a clamp 9. The body 1 is closed by a cap 10. The body 1 of the burner covered with an insulating layer 11. The porosity of the material from which body 1 and collet 3 are made is less than the porosity of the material from which the gas inlet 5 is made 5. It was established experimentally that if the porosity of material in body 1 and collet 3 is less than the porosity of gas inlet 5, less than than 2 times the flow rate of protective gas increases, and the temperature of gas heating does not exceed 35 ° C. The burner works as follows. When shielding gas enters the gas inlet 5, the rate of its outflow decreases, after which the gas passes through the collet 3 into the housing 1 to directly enter the welding zone through the nozzle 2. Laminar outflow of gas into the arc zone is achieved due to a gradual decrease in speed due to different porosity in the gas feed 5, the collet 3 and the burner body 1. The clamping of the non-melting electrode 4 is carried out by turning the knob 7 relative to the body 1, i.e., on the side, with a special nut. Compared to the base object, which is adopted as burner 1, the proposed burner has smaller dimensions and provides more reliable protection of the arc zone when welding with a non-consumable electrode in hard-to-reach places.

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Claims (1)

Arc welding torch in a protective gas environment, containing a gas supply from porous material, a housing and a contact element for supplying current to the electrode, characterized in that, in order to improve the quality of welds when welding with a non-consumable electrode in hard-to-reach places by heating the protective gas and increasing laminar flow, the housing is made with a cavity for the contact element, the housing and the contact element are made of porous material, the porosity of which is 2-3 times less than the porosity of the gas feed material Yes.