SU1614903A1 - Head for automatic arc welding - Google Patents

Abstract

The invention relates to welding and can be used in the manufacture of thin-sheet welded structures with seams of complex spatial configuration. The purpose of the invention is the expansion of technological capabilities by welding parts with cutting edges of various sizes. A spherical seat 9 is made in the head for automatic arc gas shielding by a rotating electrode 12 with a bent working end at the free end of the electrode holder 3, in which is placed a sleeve 11 with a spherical surface and longitudinal grooves on the cylindrical part for mounting the electrode 12, with a cap 13 19 nuts. In the ceramic sleeve 14, a current-carrying tip 15 is mounted, rigidly connected to the Bowden sheath 16 installed inside the insulated channel 17 in the electrode holder. To provide visual monitoring of the welding process at the free end of the electrode holder, a cup is installed coaxially with the tip 15, on the surface of which radial spring elements are made fixing the gas-forming cylinder of optically transparent heat-resistant material. 1 hp f-ly, 5 ill.

Description

The invention relates to welding and can be used in the manufacture of welded structures with seams of complex configuration.

The purpose of the invention is the expansion of technological capabilities by j welding parts with grooved edges j of various sizes. FIG. 1 shows a welding I head for automatic arc welding; Fig. 2 shows a tip for adjusting the radius of rotation of the electrode and wire, a longitudinal section; FIG. 3 is a section A-A in FIG. 2; Fig. 4 shows a device for forming a flow of protective gas; Fig, 5 is the same, a section along the plane of the spring elements,

A head for automatic arc welding, in gas-shielded welding, rotating with an electrode with an unbent working end, comprises a housing 1 rigidly mounted on the mechanism 2 of vertical movement along the axis of the electrode holder 3. The electrode holder 3 is installed in the housing 1 in a sub- through the pinion gear 4, it is connected to the electric motor 5, which causes it to rotate during the welding process. An insulated channel is made along the axis of the electrode holder, into which the filler wire is fed through the feed mechanism 6 and the straightening mechanism 7.

At the free end of the electrode holder 3 there is installed a sleeve 8 in which a spherical socket 9 is made. In the sleeve 8 there are also channels 10 providing supply of protective gas to the welding zone. In a spherical socket 9 there is a sleeve 11 with a spherical surface that turns into cylindrical . surface, with grooves for non-fusible electrode 12 on a cylindrical surface. The sleeve 11 is fixed to the sleeve 8 with a cap nut 13,

The sleeve 8 is fitted with an insulating ceramic sleeve 14 and placed inside the sleeve 11. Inside the ceramic sleeve 14 there is a metal interchangeable current-carrying tip 15 rigidly connected to the Bowden shell 16, the Shell .16 is placed inside the insulating tube 17, Through the Bowden shell and the metal tip 15 Filler wire 18 is fed into the welding process,

The electrode 12 is fixed in the working position in one of the grooves on the sleeve 11 by means of an eccentric nut 19,.

To form a protective gas flow and facilitate visual monitoring of the welding process, a sleeve 20 with radial clamping elements 21 is fixed on the sleeve 8. In the spring elements 21, a gas-forming cylinder 22 of optically transparent heat-resistant material is installed,

The head works as follows.

Before welding, the required distance (1.5-1.8 mm) is established between the working end of the electrode 12 and the filler wire 18. Then the required value of the radius of rotation R of the working end of the electrode 12 is set. For this, the nut is unscrewed by 2-3 turns 1A, which releases the sleeve 11 from fixation, the sleeve 11 rotates in the spherical socket 9 at a certain angle, which provides the specified value of the radius of rotation Rj. After that, the nut 13 is fixed and presses the sleeve 11 to the spherical socket 9, the sleeve 11 turns

due to the flexibility of the bowden shell 16,

After setting the working value of the radius of rotation of the electrode 12, a voltage is applied to the electric motor 5, which causes the electrode holder 3 to rotate through the gear train 4. A protective gas, such as argon, is supplied inside the electrode holder 3. Thereafter, a voltage is applied to the head body 1 from the power source and the melade by the electrode 12 and an electric arc is excited by the parts to be welded.

When the arc ignites, the motor of the filler wire feeding mechanism 6 is turned on. Filler wire 18 through the mechanism, 7 changes, isolated Bowden shell 16, tip 15 enters the arc zone. In the process of welding the wire J8 makes a synchronous rotation with the electrode 12.

The tip 15 has an internal diameter of 0.1-0.15 mm larger than the diameter of the filler wire. This ratio of diameters makes it possible to prevent the filler wire 18 from beating during the rotation of the electrode holder 3 and thereby eliminate the possibility of the filler metal falling on the electrode 12, which leads to disruption of the welding process. The tip 15 is made for each diameter of the filler wire used.

The mechanism 2 for tracking the length of the arc and the vertical movement maintains a constant distance between the electrode 12 and the product to be welded.

When welding products in difficult places with a short arc, visual control is difficult. Over the course of the process. To provide visual control, the gas forming cylinder 22 is made of optically transparent material. Therefore, a free overview of the burning zone is ensured directly through it.

An experimental sample of a pre-made head for automatic coal welding by a rotating electric machine is made, which is mounted on a P9M machine. Using a head, weld seams of complex configuration on a product from VNS2 steel of thick- ness.

40 45

5 (3

55

149036

1.8 mm thick. The total length of the seams is 70.5 m. The head showed high performance and reliability.

Thus, the proposed head makes it possible to drastically reduce the number of defects in extended welds on products and to increase

10 reliability of welded joints.

F o

rmula invention

NIN

Claims (2)

I. A head for automatic welding gas shielding by a rotating non-melting electrode with a bent working end, comprising a housing rigidly fixed on the movement mechanism, an electrode holder with its rotation mechanism, an isolated channel for feeding filler wire and a channel for protective gas, as well as interchangeable current-carrying tip 5, which, in order to expand technological capabilities by welding parts with grooved edges of various sizes, it is equipped with a sleeve with a spherical surface with a longitudinal grooves on the cylindrical surface, an eccentric nut, a ceramic sleeve, the feed channel 35 is filled with a Bowden shell, and on the working end of the electric holder a spherical socket is placed, in which the sleeve with a spherical surface is placed, the electrode 40 is installed in one of the longitudinal grooves of the sleeve with a spherical surface and fixed with an eccentric nut, and the interchangeable tip is placed in a ceramic sleeve and rigidly connected 45 with Bowden's olochkoy insulated duct for feeding the filler wire. 2. The head according to claim 1, characterized in that, in order to improve (3 visual monitoring of the welding process, it is equipped with a gas-forming optically transparent heat-resistant cylinder and a metal cup, on the surface of which radial spring elements are made for fixing cylinder, while the metal cup is installed coaxially with a replaceable tip. five go 12 1 nineteen Fig.Z 21 15 AND 5