SU1496949A1 - Torch for gas-shielded consumable-electrode arc welding - Google Patents

Abstract

The invention relates to welding technology and can be used for semi-automatic and automatic welding in a protective gas environment. The purpose of the invention is to maintain welding in hard-to-reach places and to improve the quality of welding by improving the gas protection of the weld pool. The burner comprises a housing 1 with annular nozzles 2 and 3 for supplying protective gas having at least two concentrically arranged guide 5 longitudinal blades 4 for layer-by-layer supply of different gases to the welding zone. The radome 8 of the burner has a teardrop shape and is directed to the welding zone with its narrowed end. Between the nozzles 2 and 3 is located the nozzle 13 for additional charging of protective gas. The nozzles are equidistant. The burner has an external aspiration nozzle 10 with longitudinal 11 and guide vanes 12. Nozzle 13 prevents disruption of gas protection during intensive aspiration. Intensive layer-by-layer supply of gases to the arc burning zone causes an intense heat transfer process, accompanied by an increase in the temperature gradient and temperature in the arc zone. In this case, the effect of arc compression is observed, which ensures the activation of metal melting. 3 il.

Description

3149

The housing 1 has a channel 6 for feeding the electrode 7, a drop-shaped fairing 8 with a current-carrying element 9 located inside is located at the end of the housing. The longitudinal blades 4 are set equidistant between themselves and the shape of the fairing 8. The burner is equipped with an aspiration nozzle 10 for suction of aerosols from the welding zone, in which two longitudinal vanes 11 with guide vanes 12 are also installed. In the burner housing 1 there is an annular nozzle 13 for additional pressurization of the gas,.

The device works as follows

The burner is installed above the joint of the parts to be welded. Through the current-carrying element 9, current is supplied to the electrode 7 supplied through channel 6. When the electrode 7 touches the joint of the parts to be welded, an arc is ignited and welding takes place. To protect the zone 1 of the arc from oxidation, through nozzles 2 and 3, protective gases are introduced, for example carbon dioxide, argon, washing the electrode 7 and the fairing 8, in which the current-carrying element 9 is placed.

On the α-outlet from the longitudinal blades, the 4-gas flow passes through the guide vanes 5, receives rotation around the axis of the burner, and the swirling laminar flow is more stable than the normal flow.

; Dn.stabilization and direction of the flow of sucked gases, the direction of the twist coincides with the direction of the twist of the flow at the outlet of the longitudinal blades when the protective gas is supplied. In order to stabilize the gas protection of the weld pool and prevent disruption during intensive work: the aspiration system through the nozzle 13 retracts; an additional gas flow is provided that provides a pressure: in the indicated zone.

: Intensive layer-by-layer supply of protective gases to the arc burning zone causes intense heat transfer, accompanied by an increase in the temperature gradient and temperature in the arc zone,

arc compression effect, which provides a significant activation of metal melting. The flow of gases facilitates the transfer of metal to the welding zone.

The proposed burner improves welding quality at the expense of. stabilization of the welding process. The use of various gases and their mixtures makes it possible to weld carbon, low-alloyed, high-alloyed steels and alloys as well as non-ferrous metals. The design features of the burner allow it to be used for welding small-sized, complex-shaped products, working in hard-to-reach places, and also used for automatic welding and welding robots.

Claims (1)

Invention Formula A torch for arc welding in shielding gases with a melting electrode, comprising a housing, a channel for sweeping the electrode, a fairing and a current-carrying element located therein, an annular nozzle for supplying protective gas, characterized in that in order to ensure welding in hard-to-reach places and improving the quality of welding due to the improvement of the gas protection of the weld pool; the burner is equipped with two additional annular nozzles for supplying protective gas, an external aspiration circular nozzle, and longitudinal blades for directing no flow of shielding gas and suctioned air and directed with blade blades for turning the flow of shielding gas and suction air, the main and adjacent additional nozzle for supplying shielding gas and the suction nozzle are two-stage, with the steps of these nozzles concentric with the axis of the burner body one above the other in the direction from the fairing, which is drop-shaped, and the longitudinal blades for directing the flow of protective gas are set equidistant between themselves and located 2 ( nozzles. ten -f V /////////// S $: S. Fy -ABOUT. Figg JV FIG.