SU1349922A1 - Torch for arc welding - Google Patents

Abstract

The invention relates to welding production equipment and can be used for semi-automatic welding in an environment of ordinary gases. The purpose of the invention is to improve the quality of the C-joint by directing the effect of the laminar flow of protective gas on the welding zone and reducing the flow of protective gas. When the current-carrying tip 4 enters the annular cavity 7, the shielding gas flow creates a counter-pressure to the main gas flow from the annular gap 6 and is directed into the annular gap between the curvilinear surface of the current-carrying tip 4 and the inner surface of the nozzle 8 to the welding zone. In this case, a stable directional, flow of shielding gas is formed, which improves the protection of the arc and the surrounding zone from the external environment. I il. (L

Description

The invention relates to equipment for welding production and can be used for semi-automatic and automatic welding in shielding gases.

The purpose of the invention is to improve the quality of welded joints by directing the laminar flow of protective gas to the welding zone and reducing the consumption of protective gas.

 The drawing shows the burner, section.

The torch contains a current-carrying mouthpiece 1 with a channel 2 for guiding the welding wire, channels 3 for supplying protective gas and a current-feeding tip 4, a cup 5 mounted on the mouthpiece 1, with a gap 6 for passing the protective gas.

The current-carrying tip is made with a longitudinal section in the form of a cardioid and an open annular cavity 7 located on the non-working end.

The burner has a nozzle 8, the inner surface of which repeats the shape of the tip 4. In the drawing, a welding wire 9 (melting electrode), a welding bath 10 of molten metal are indicated.

The burner works as follows.

When the welding wire feeding mechanism 9 is turned on simultaneously, through channels 3 of the mouthpiece 1, protective gas is supplied under pressure, which flows through the annular gap 6. Falling into the annular cavity 7 of the current-feeding tip 4, the protective gas flow creates a counterpressure to the main gas flow flowing out of the annular gap 6, and is guided into an annular gap between the curved surface of the current lead tip 4 and the inner surface of the nozzle 8 to the welding zone.

Example. To compare the known and proposed burners, the butt joints of the material with a thickness of 10 mm and edge preparation are welded. Welding is performed in the following mode: welding current / s 250A with an electrode diameter of 1.6 mm and welding speed

0

five

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Eu b m / h with shielding gas flow qr 18 l / min and nozzle internal diameter mm. Carbon dioxide consumption is determined by a rotameter. The quality of the welded joint depends on the magnitude of the shielding gas consumption and for a known torch is in the range of 17-18 l / min. In the proposed burner, with a gas flow rate of 18 l / min, there is an unstable arc arc and a large weld mass. With a decrease in the value of the flow of protective gas to 12 l / min, a stable arc is observed and the ground is good, with a smooth surface.

Reducing carbon dioxide consumption in the proposed burner with good weld quality is due to the shape of the outer surface of the current-carrying tip and the annular gap between the current-feeding tip and the curved surface of the nozzle, which allows to form a stable directional flow of protective gas that improves the protection of the arc and the okolar zone from the environment .

Claims (1)

Invention Formula A torch for gas-shielded arc welding containing a current-supplying mouthpiece with a channel for guiding the plane of the first electrode and a current-carrying tip made with an annular an open cavity at the non-working end, mounted on the mouthpiece of a cup with a hole in the bottom for the passage of protective gas, characterized in that, in order to improve the quality of welded joints by directing the laminar flow of protective gas to the welding zone and reducing the consumption of sealed gas, the current-carrying the tip is made with a longitudinal section in the form of a cardioid and a funnel-shaped cavity with a hole at the working end, and the inner surface of the nozzle is made in the form corresponding to the outer surface of the current lead and its tip.