CS209706B1 - Apparatus for connecting articles, in particular electrical conductors - Google Patents

Abstract

This involves soldering using solder inserted between the objects to be soldered, followed by resistance heating of the soldered areas by pressure electrodes. The purpose of the invention is to achieve more intense resistance heating of the soldered areas, thereby shortening the soldering time and improving the quality of the joint. The stated purpose is achieved by a new design of the pressure electrodes. Each of the two pressure electrodes consists of an electrically conductive and electrically insulating part, which fit together in the pressure surface, with the axis of the electrically conductive section of the pressure surface of the first electrode lying outside the axis of the electrically conductive section of the pressure surface of the second electrode. The entire arrangement is shown in Fig. 3. The invention is particularly suitable for use in the electrical industry, both in mass and piece production.

Description

(54) Equipment for connecting objects, especially electric conductors

It is soldering by means of solder inserted between soldered objects, followed by resistance heating of soldered places by pressing electrodes. The purpose of the invention is to achieve a more intense resistance heating of the brazing points, thereby shortening the brazing time and improving the quality of the joint.

This is achieved by a new embodiment of the pressure electrodes. Each of the two pressure electrodes consists of an electrically conductive and electrically insulating portion which fits together in the pressure surface, wherein the axis of the electrically conductive portion of the pressure surface of the first electrode lies off the axis of the electrically conductive portion of the pressure surface of the second electrode.

The whole arrangement can be seen in Fig. 3.

The use of the invention is particularly suitable in the electrical industry, both in bulk and in piece production.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for joining articles, in particular electrical conductors, by soldering by means of a solder interposed between articles, provided with at least one pair of thrust electrodes for resistance heating of soldered places.

The apparatus used up to now has electrodes whose contact surfaces are directly opposite one another, are coaxial and electrically conductive over the entire surface. Despite the fact that the local heating takes place relatively quickly, it is necessary to wait some time for the soldering points to heat up sufficiently, but this accumulated heat damages the insulation of the conductor in close proximity to the joint.

Therefore, this method of soldering is not advantageous for insulated conductors.

This drawback is remedied in an article joining device according to the invention which comprises at least one pair of pressure electrodes for resistance heating of soldered places, each electrode consisting of an electrically conductive part and an electrically insulating part, which fit together in the pressure and the axis of the electrically conductive pressure portion of the first electrode of each pair lies off the axis of the electrically conductive pressure portion of the second electrode of the pair.

By shifting the electrically conductive portions of the two electrodes of one pair, the resistance that the brazed material imparts to the electrical current is increased, the greater the losses the more heat, which shortens the time needed to heat the material, the brazing time shortens, increasing labor productivity. The brazing point has higher electrical conductivity and strength, and the insulation remains intact.

An exemplary embodiment of the device according to the invention is shown in the attached drawing, in which

Claims (3)

SUBJECT V A device for joining articles, in particular electrical conductors, by soldering by means of a solder interposed between articles, provided with at least one pair of pressure electrodes for resistance heating of soldered places, characterized in that each electrode consists of an electrically conductive part (2) and an electrically insulating part 3, which align together in the pressing surface (1), wherein the axis (8) of the electrically conductive section of the first electrode of each pair lies outside the axis (9) of the electrically conductive section of the second electrode of the same pair. Fig. 2 shows a perspective view of one electrode, Fig. 2 shows an electrode contact surface, and Fig. 3 shows a perspective view of a pair of electrodes including the conductors to be connected. The device according to the invention is provided with at least one pair of pressure electrodes made of a copper-chromium alloy for resistance heating of soldered places. Each electrode consists of an electrically conductive part 2 a. The two electrodes of one pair are arranged such that the axis 8 of the electrically conductive portion 8 of the first electrode lies outside the axis 9 of the electrically conductive portion 2 of the second electrode. This arrangement can be seen in Fig. 3, where the electrodes are shown together with the first conductor 5 and the second conductor 6 between which a silver foil solder 7 is inserted. The electrically conductive portion 2 of each electrode is provided with a shoulder whose face forms a conductive section The surface 1 and the remainder of the electrically conductive Part 2 are stitched at an angle extending from the shoulder to the edge of the electrode. A groove is formed in this inclined surface in which the electrically insulating portion of the electrode 3 is mounted. Between the stepped electrically conductive part and the electrically insulating part 3 there is an air gap 4 which assists in the thermal separation of both parts of the electrode. The electrically insulating portion 3 is preferably made of a ceramic material, but may be made of mica or other electrically insulating material, preferably also thermally insulating. By shifting the two electrodes of one pair along the brazed conductors 5, 6, it is possible to further change the electrical resistance of the brazed spot and thereby influence the soldering time. 1, characterized in that the electrically conductive part (2) of the electrode is provided with a shoulder whose face forms a conductive section of the pressing surface (1) and the rest of the electrically conductive part (2) is sewn at an angle extending from the shoulder to the edge of the electrode; a groove is formed in the inclined surface in which the electrically insulating electrode portion (3) is fastened. Device according to Claim 2, characterized in that the electrically insulating electrode part (3) is arranged at a distance from the shoulder of the electrically conductive part (2) of the same electrode.