RU1478525C - Burner for arc-welding in protecting gas atmosphere - Google Patents

Abstract

The invention relates to torches for arc welding in a shielding gas medium and can be used in torches for manual welding by a non-consumable electrode. The purpose of the invention is to reduce the consumption of shielding gas and increase the reliability of the burner.

Description

1

The invention relates to welding, in particular to manual torches for arc welding in a shielding gas medium with a non-consumable electrode, and can be used in all sectors of the national economy.

An object of the invention is to reduce shielding gas consumption and increase burner reliability.

In FIG. 1 schematically shows the proposed burner, General view; in FIG. 2 - conical plug with slots; in FIG. 3 - section aa in figure 2; in FIG. 4 - a spiral, conventionally divided into sections, denoted by the letters A, B, B, D, D, E, G, 3, I, K, L, M, H, 0.

The torch for arc welding in a protective gazpu environment contains a housing 1, inside of which there is a holder 2 with a collet clamp 3. In the housing 1, holes 4, 5 are made for the entrance and exit of the shielding gas respectively into the nozzle 6 and further to the weld pool 7. The torch also contains a non-melt a connecting electrode 8 mounted in a collet clamp 3 and a spiral 9 for controlling the shielding gas flow parameters. The spiral 9 at one end is rigidly fixed to the housing 1 and elongated along the gas supply pipe 10 “At the free end of the spiral 9 there is a conical plug 11 with longitudinal slots 12. The spiral 9 is curved along an odd number of sinusoids 13 alternating with U-shaped sections 14.

Spiral 9 (see Fig. 4) has longitudinal rectilinear sections AB (ZI, MN) and transverse sinusoids 13

(BVGDEZHZ, IKLM, ...), where Cu is a part of a spiral made of copper; Fe - part of a spiral made of iron; II - the position of the spiral before heating; III - the position of the spiral as a result of thermal deformation. In the WHERE section, the spiral 9 is twisted 180 relative to the initial position. Thus on the longitudinal

sections AB, ZI, MN, etc. the arrangement of the layers of iron (Fe) and copper (Cu) alternately changes (as a result of the twisting of the helix in the GDE section), and in the transverse sections of the BHG

and EZHZ on the inner surface is a layer of copper (Cu). A prerequisite for the required axial extension of the spiral 9 is an even number of longitudinal sections (to compensate for the bending of the spiral 9 in these sections) and an odd number of sine waves 13. The adjacent transverse half-waves of sine waves 13 form an alternating letter

5 G1 (sections ZHZIK, LMNO, ...). Outside of the U-shaped portions, it always appears on the part of the spiral 9, which is made of copper (Cu). This explains the significant movement of the spiral 9 during heating in the axial direction of the gas supply pipe 10.

The proposed shape of the spiral 9 (alternating U-shaped sections and sine 5 sinusoids) and the material (bimetal iron-copper) provide sufficient movement of the spiral 9 with a conical plug 11 along the axis of the gas supply pipe 10, as well as sufficient force to clamp and hold the conical plug 11 in shielding gas supply openings.

Due to the presence of longitudinal slots 12 on the cork, the shielding gas cannot be completely shut off, but it was fixed by. - TJ-b-. - “

they are pulped through them into the gas supply pipe not in a wide stream, but in a smaller quantity, which, alone, is sufficient to provide high-quality protection of the weld.

Spiral 9 (see Fig. 3) is conditionally divided into three sections, each of which is equal to T, where T is the step of the spiral. f5

When heated, each of the three sections elongates by 1.5-2.0 mm. Due to its shape, the spiral moves towards the inlet for the protective gas by a length equal to 20 1, which is calculated by the formula

1

L di

where N is 1.5-2.0 mm. Then 1 1.1.5-2,, 5-6.0 mm, i.e. spiral 9 with end plug 11 at the end is mixed by a value of 1 4.5-6.0 mm, sufficient to block the free flow shielding gas entering the gas supply pipe 10.

Spiral 9 is made of bimetal iron-copper. These materials have different thermal conductivities and different linear expansion coefficients. Copper has higher coefficients, due to which the copper half of the tape experiences large temperature deformations. As a result, the spiral tape bends toward greater deformation.

As for the sine wave, as a result of the 180-degree twisting of the tape, inside each half-wave of the sinusoid, the part of the tape that is made on copper appears. This is an indispensable condition for the spiral in snusoid areas to work precisely under tension, and not compression, which is inevitable in the opposite case.

In order to ensure the reliability of the work of the spiral in tension as a whole and to achieve significant linear directional movement, the spiral in U-shaped sections also works for extension. This is achieved by

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that on the outside of each U-shaped section there is that part of the tape, which is made of copper. The burner works as follows.

The non-floating gypsum electrode 8 is installed in the collet clamp 3 with the necessary overhang on the nozzle media b. Then, through the gas-gas supply 10, the protective gas is supplied to the welding place, after which the welding current is supplied from the source and the electric arc is turned on.

The edges of the parts to be joined are heated until they melt, forming a common weld pool 7. An abundant shielding gas stream provides reliable protection for the weld pool 7 from oxidation by oxygen and nitrogen.

Some time after the ignition of the welding arc, the nozzle 6 and the torch body 1 and the current supply tube 10 are heated and the protective gas passing through them begins to heat, while the volume of gas increases and it already requires a smaller amount to provide reliable protection for the weld pool. At this point the bimetallic spiral 9 is also heated, which, under the influence of thermal deformations, lengthens and moves the cone-shaped plug 11 along the axis of the gas supply pipe 10 into the horn hole for supplying protective gas to this pipe. At this stage, the plug 11 partially reduces the cross-sectional area through which the protective gas passes into the gas supply pipe 9, thereby reducing the flow of protective gas through the burner. After turning off the welding arc 7, the parts of the torch are gradually screwed up and the bimetallic spiral 9 returns to its initial position, moving the plug 11 and increasing the cross section of the hole for supplying the protective gas to the gas supply pipe 10.

Bimetallic spiral 9 operates as follows.

When heating the bimetallic spiral 9 from a heated protective gas, the longitudinal sections of the spiral AB, ZI, MN, etc., are bent, and adjacent sections are bent in opposite directions, since the number of sections is even, the bend is mutually compensated and the sinusoidal effects of the BVGDEZZ spiral 9 are still

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BUT PROPGP NOAH U-M I OKOI AZO-CHILDREN coarse HI. When heated by the BLUE-Idachny SCHOLARI scrachi VRI, G, ZhZ, etc. pigments ich rlzpt igamts, since a layer of Cu metal with a wider linear expansion than on the outer ones is located on all the internal sections of the BHG and EZhZ, which results in the axial extension of the bimetallic spiral 9 “When it cools, it occurs in the reverse order.

EFFECT: invention provides economical consumption of shielding gas due to its automatic regulation during the welding process. In addition, since the spiral is located on a gas-tight tube, it works much longer than when placed in the nozzle zone, where the temperature drops are much lower than in the gas and gas supply tube.

The proposed torch provides high-quality protection for the welded joint and is more reliable and intrinsic during operation, since it eliminates the visual control of the welded joint over the shielding gas consumption and the welding process, changing it automatically when heating the gas and gas tube and the protective gas in it, which made / - °. i D) 6

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The torch of the bottom arc welding in a shielding gas medium is non-floating, "lay down a city containing a nozzle, a housing, a coaxial gas tube. A separate tube and a spiral to control the flow of annealed gas, such as, in order to reduce the consumption of sinter gas and increase the burner operation reliability, a spiral made of bimetal with an odd number of sinusoidal sections alternating in U-shaped sections, a part of the sinusoidal section is twisted by 180 °, the metal layer with a large coefficient of linear expansion is located inside ka SEMI-WAVE sine waves and outside of each I-shaped section, and on one of

A conical plug with longitudinal slots was made at the 25 ends of the spiral; in this case, the spiral is located inside the gas supply pipe, the butt of the U-shaped sections are located along the tr-b30 axis, and the conical plug is located in the inlet of the toxin gas outlet tube.

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