FI68009C - METALLELEKTROD FOER ANVAENDNING VID BAOGSKAERNING SAMT EN BAOGSKAERNINGSANORDNING - Google Patents

Description

1 68009

The present invention relates to a metal electrode for use in arc cutting and connected to the other pole of a power supply.

The present invention also relates to an arc combustion apparatus having the above-mentioned metal electrode with possible auxiliaries, means for moving the electrode along the work site and means for connecting the electrode to an electric power source.

Welding is divided into two main groups, namely press welding and fusion welding. In fusion welding, the metal is in the molten state and the joining takes place without compression or impact. Melting inertia includes e.g. gas welding and arc welding. In arc welding, the heat source is a burning electric arc between the electrode and the workpiece. The electrode is connected to the terminal of the power supply and the workpiece is connected to its other terminal. A metal scrub coated with an excipient such as flux is used as the electrode, from which the molten metal and flux acting as filler are transferred to the weld seam by the action of an arc. Arc welding can also be performed in a shielding gas, in which case the arc burns between the endless electrode and the workpiece. The molten area is protected from the atmosphere by introducing an inert gas or gas mixture suitable for the welding site. Metals can also be cut by welding with cutting methods related to gas, such as gas and arc cutting. In arc cutting, the arc is used to cut metals. Electric cutting can be done with a carbon or metal electrode. In order to improve the shear efficiency, oxygen gas is used in connection with the electrode, which is blown through a special nozzle or through a hole drilled in the electrode to the cutting point. In an oxygen arc cut, an arc is thus used as a heat source, and the cut takes place with oxygen gas. The cutting electrodes are usually tubular protective coated electrodes, and this method of cutting is particularly advantageous for performing underwater combustion surgery.

The object of the present invention is to provide a metal electrode for use in arc cutting, with which arc cutting can be performed even faster and more reliably.

It is also an object of the present invention to provide an arc burner equipped with the above-mentioned metal electrode, which is even simpler and which is suitable for position welding even in very difficult conditions. In particular, it is an object of the present invention to provide an arc incinerator for underwater welding and flame cutting. In addition, the operation of the equipment is very easy and simple to automate.

The main features of the invention appear from the appended claims.

The disc-shaped electrode according to the invention has channels extending from the central part of the disc to its circumference for conducting shielding gas or compressed air or oxygen used in combustion cutting to the work site via a channel or channels directed towards it. In this case, every other channel can be shorter and connected to at least one adjacent channel, whereby the shorter channels end on the circumference of the disc. The channels of the disc-shaped electrode may be formed by a corrugated plate between two layers of additive.

In a disc-shaped electrode, which is particularly suitable for underwater combustion, the channels are formed at least in part by a mixture of aluminum and brass and iron oxide, which, when burned, generates a high heat, the so-called thermal combustion. The hot gas and melt generated by the termite combustion are blown with compressed air into the work site through ducts running inside the blade.

In the arc combustion apparatus according to the invention, a disc-shaped electrode of the above-mentioned type is attached to a rotatable shaft, which shaft is attached to a motor rotating it and electrical control means for connecting the disc-shaped electrode to an electric power source.

The invention will be described in more detail below with reference to the accompanying drawings, in which Figures 1 and 2 show the arc burner according to the invention in two different working positions, , Fig. 4 shows a front view of the arc section electrode of Fig. 3 and Fig. 5 shows a front view of two alternative arc section electrodes, with the upper half showing a different embodiment than the lower half.

As can be seen from Figures 1 and 2, the arc burner according to the invention consists of a shaft 2 rotatable about its longitudinal axis, to which a replaceable and circumferentially dissipating disc-shaped electrode 1 is attached and which is rotated by a motor 6 at one end of the shaft 2. Also attached to the shaft 2 is a power line 4 connected to one terminal of an electric power source (not shown) for conducting an electric current through the shaft 2 to the electrode 1 to form an arc between the periphery 11 of the electrode 1 and a workpiece 8 connected to the opposite side of said power supply. terminal. Due to the resulting arc, the disc-shaped electrode 1 melts at its circumference 11. In the device according to the invention, the shaft 2 is hollow for conducting compressed air or oxygen to the channels in the disc 1, which are shown in more detail in Figures 3-5.

The shaft 2 with its electrodes 1 and motors 6 is articulated to an arc welding or arc torch body, not shown in more detail in Figures 1 and 2. This frame may be a wheeled carriage which can be moved forward as welding or flame cutting progresses and to which the shaft 2 is fitted, that it can fall lower as the electrode 1 wears around its circumference 11.

The rotatable shaft 2 is preferably provided between the electrode 1 and the motor 6 with a bending joint 5 made of plastic or other non-conductive material, which enables position welding, as shown in Fig. 2.

The arc burner according to the invention can be easily adapted for automatic operation. It is very fast acting. In flame cutting, it is possible to achieve 60% higher shear efficiencies than with conventional cutting methods.

Figures 3-5 show various disc-shaped arc cutting electrodes which are particularly suitable for flame cutting of underwater metal structures. Figure 3 shows two different embodiments, the lower half of which shows a disc-shaped flame cutting disc, in which between the two protective agent layers 16 there is a disc-like additive layer 18 formed with radial pin-like channels 17 extending from an opening 10 in the middle of the disc 1.

Between these radial channels 17, 5 68009 shorter subchannels 17 'can be formed, which join the adjacent channels 17, as shown in the upper half of Fig. 3.

The flame cutting disc is preferably of termite construction, part of which is made of aluminum or brass, in order to achieve termite combustion, which generates a very high temperature. The molten and hot gases thus formed are then blown with compressed air or oxygen along the channels 17, 17 'in the blade 1 to the object to be cut.

Compressed air or oxygen is introduced into the ducts 17, 17 'along the hollow axis of the blade 1 and is directed to those ducts 17, 17' which are in each case directed towards the workpiece.

Figures 4 and 5 show different channel shapes. In the embodiment shown in the upper half of Figure 5, the channels 17 are formed by a corrugated sheet metal plate 19 sandwiched between a layer 18 formed of a protective material 16 and a melt-forming additive.

Claims (7)

A metal electrode intended for use in cup cutting and to be connected to one pole of a power source, said electrode being a rotatable disc (1) whose periphery (11) is intended to be positioned against the workpiece (8) and to move along it the disk rotates about its transverse axis, characterized by channels (17) extending from the central portion (10) of the disk (1) to its periphery (11) for supplying compressed air or oxygen to the working object (8) along a channel ( 7) or channels directed to it. Electrode according to claim 1 intended for use in cup cutting, characterized in that each other channel (17 ') is shorter and connected to at least one adjacent channel (17). 3. An electrode according to claim 1 for use in cup cutting, characterized in that the channels (17) consist of a corrugated disc (19) between two layers (18) of additive. 4. An electrode according to claim 1, 2 or 3, characterized in that the blank (18) of which the channels (17, 17 ') consists is at least partially of termite construction for the purpose of obtaining thermal combustion. 5. Cutting device with a metal electrode (1) with optional additives, means (2, 6) for moving the electrode (1) along a working object (8) and means (4) for connecting the electrode to a current source, at which the electrode is a substantially circular disk (1) and the electrode displacement means is a rotatable shaft (2) to which the disk (1) is attachable and a motor (6) for rotating the shaft (2) coupled to electrical conductors ( 4) characterized by channels (17) extending from the central portion (10) of the disk (1) to its periphery (11) for feeding