SU740441A1 - Method and plant for high-frequency overlapping welding of strips - Google Patents

Description

one

The invention relates to the metallurgical industry, to the field of production by the method of high-frequency welding of welded tapes from two or more original strips.

The invention can most effectively be used in the production by the method of high-frequency welding of thermo-bimetallic tapes when joining overlap edges in the production of welded tapes from dissimilar materials.

There is a known method of high-frequency welding of bimetallic strips, in which the strips are set in a welding stand at an angle of 2-5 ° with the help of a tapering device. Tokopodvod to the edges of the original bands is carried out using a special contact device, one of the contacts is placed on the inner surface of the edge of the original strip, and the second contact is placed on the outer surface of the edge of the other original strip 1.

The disadvantage of this method is that as a result of this current supply, additional power losses arise due to current spreading on the strip, the current lead to which is carried out from the outer surface of the edge.

As disadvantages of the design of the device implementing this method, it is possible to note the complexity of the contact device, 5 which should have a spring mechanism for pressing the contact tips to the edges of the original strips.

The closest to the proposed technical essence and the achieved result is a method in which the strips are supplied at a certain angle to each other with the help of a deflection device, the contact device feeds high-frequency currents to the edges, heats them to the welding temperature and burns 2

Of the known devices for high-frequency welding of the overlap strips, the one closest to the proposed one is an installation comprising a pulling mechanism installed in a technological sequence,

Claims (2)

A 20-angle device, a contact device associated with a high-frequency energy source of copper water-cooled women, a welding unit and a braking device 2. However, this method also does not provide a current supply to the edges facing each other, and its installation is cumbersome. spring mechanism for pressing the contact tips. The purpose of the invention is to improve the electrical power supply and reduce power losses to the welded edges, as well as to simplify the installation design. This is achieved by the fact that, in the proposed method, the impinging and contacting devices are placed between the edges to be welded, and the pressing of the strips to the contacts of the contacting device is carried out due to the spring properties of the strips. In order to implement this method, the proposed sinking device is made in the form of an insulating insert with contacts mounted on it and water-cooled tires of the contact device. This solution of the technical problem, when the angle device simultaneously has the functions of a contact device, allows to significantly simplify the installation design, and the arrangement of contacts between the edges to be welded significantly improves the current supply due to the reduction of power losses to the edges being welded. FIG. 1 shows the proposed installation for high-frequency strip welding, side view; in fig. 2 - the same, top view. The installation for high-frequency strip welding consists of a pulling device 1 designed to evenly pull the welded tape 2 and wind it into rolls 3 at the same time. The welding unit 4 serves to fix the strips 5 in the welding zone 6 and create the necessary upsetting force. As a cornering device, which simultaneously serves as a contact device, an insulating insert 7 is used with water-cooled copper tires 8 fixed on it, to which contact tips 9 of wear-resistant refractory material are attached. Brake device 10 is used to create the necessary force to press the original strips 5 to the contact tips 9, as well as to create the necessary displacement of 8 edges of the strips 5 before welding. During the welding process, the strip 5, due to spring properties and due to braking in the braking device 10, is pressed against the contact tips 9. In addition, in the braking device 10, the strips 5 are fixed and the edges b are required before welding and draft in the welding unit 4. The convergence angle is adjusted for the purpose of obtaining a quality joint, as well as the alignment of the heating of the edges when welding dissimilar metals is carried out by displacing the insulating insert 7 with water-cooled copper tires 8 mounted on them The contact tips 9 are fastened in the direction A-A, as well as by adjusting the thickness of the insulating insert. The proposed method of high-frequency strip welding and installation for its implementation in comparison with the known ones allows simplifying the design of the installation and improving the current lead. There is no need to use a special coal throwing device, and what is especially important when welding at a frequency of 440 kHz, the device of pressing the contacts to the edges of the original bands. In addition, the current lead is carried out on the edges of the original strips facing each other, which leads to a decrease in power losses and an improvement in the quality of the welded joint. Claim 1. A method of high-frequency welding of overlap strips, in which the strips are supplied at a certain angle to each other using a deflection device, a contact device is applied to the edges of a high-frequency current, heated them to the welding temperature and compressed. improving the electrical power supply and reducing power losses to the edges to be welded, the deflection and contact device are placed between the edges to be welded, and pressing the strips to the contacts of the contacting device was due to the spring properties of the strips. 2. An installation for carrying out the method according to claim 1, comprising a pulling mechanism installed in the processing sequence, a deflection device, a contact device associated with a high-frequency energy source of copper water-cooled tires, a welding unit and a brake device, characterized in that the deflection device is made in the form of an insulating insert with contacts fixed on it and water-cooled tires of the contact device. Sources of information taken into account during the examination 1. N. Glukhanov and V. Bogdanov. Welding of metals with high-frequency heating. M., - L., Mashgiz. 1962, p. 184. 2. The patent of France No. 1522892, cl. In 23 K 13/00, 1968 (prototype). eight 3 3 ten / (rig 2