SU1486288A1 - Apparatus for welding with arc rotating in magnetic field - Google Patents

Description

The invention relates to the welding of an arc rotating in a magnetic field, and can be used when welding thin-walled tubular sections of low-carbon and low-alloy steels. The purpose of the invention to improve the quality of the welded joint. A device for welding by an arc rotating in a magnetic field contains a ring electrode 1, installed

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inside the limiting sleeve 6, the magnetic system 2. The electrode 1 is spring-loaded relative to the sleeve 6 and is installed with the possibility of longitudinal movement relative to it. The device provides heating and melting of welded parts 4 and 5 with

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the subsequent compression of the edges of the electrode 1 and the walls of the sleeve 6. The device allows high-quality welding in the atmosphere behind the shield gases and in the air, and reduces rejects due to the continuity of the welds, 1 Il.

The invention relates to the welding arc, rotating in a magnetic field, and can be used when welding 15 thin-walled tubular sections of low-carbon and low-alloy steels.

The purpose of the invention is to improve the quality of the welded joint. 20

The drawing shows a device for welding arc rotating in a magnetic field.

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A device for welding by an arc rotating in a magnetic field contains an annular non-consumable electrode I connected to the minus of the power source, a magnetic system 2 for turning 30

The welding arc 3 between the electrode 1 and parts 4 and 5. Coaxially the electrode 1 is installed covering its restrictive sleeve 6, made of heat-resistant material, such as steel increased heat resistance R12FZ.

The electrode 1 is spring-loaded relative to the sleeve 6 by the spring 7 and is installed with the possibility of longitudinal movement relative to it. The annular channel 40 of the sleeve 6 is made tapered, expanding towards the non-working part of the electrode 1 for the free movement of the latter in the channel 8 at the moment-draft. Welded parts 4 45

and 5 are connected to the "minus" of the power source by means of clamping jaws 9 and are mounted on the support 10. The free movement of the electrode 1 is limited by the spring 7 and is 2-4 mm. 59

The device works as follows.

Oscillator Excite a welding arc 3 between electrode 1 and parts 4 and 5. Using a magnetic system 2 55, they create a magnetic field rotating the arc 3, and they heat and melt the edges of the parts 4 and 5 to be welded.

After the formation of a molten metal bath, a draft is produced with the welding current turned off and the weld is formed. In this case, the welded parts 4 and 5 through the stop 10 under the action of the axial force P are moved upwards until they come into contact with the spring-loaded electrode 1, which is included in the limiting sleeve 6. Parts 4 and 5 are pressed out by the electrode 1 and the side walls of the sleeve 6, which ensures the formation of the weld. After removing the axial force P, the electrode 1 returns to its original position under the action of the spring 7.

The Krlz electrode is made of chromium bronze BRS, 7 and the limiting sleeve of steel R12FZ. Weld parts with a wall thickness of 0.7 and 1.2 mm. In this case, the welding current is set at 100 and 250 A, and the voltage is set at 50 and 60 V, respectively. Welding time 0.5 and 2 s. Specific precipitation pressure of 2 and 3 kgf / mm ² . Precipitation time is 1 and 2 s, precipitation speed is 100 mm / s

Welding and the formation of a weld of parts with a wall thickness of more than 1.2 mm is difficult ¹ , due to the large axial forces and currents necessary to obtain a high-quality weld.

The device provides high-quality welding in a protective atmosphere and in air.

The use of the proposed device allows reducing scrap due to the discontinuity of welded joints by 35-40%.

Claims (1)

Claim A device for arc welding, rotating in a magnetic field, containing a non-consumable ring electrode connected to the minus of the power source, and a magnetic system, characterized in that, in order to improve the quality of the welded joint, it is equipped with a coaxial coaxial electrode and encompassing it limited to 886288 sleeve, and the electrode is spring-loaded relative to the sleeve and installed with the possibility of longitudinal movements relative to her. five