Methods for connecting wires from high resistance alloys. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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To connect wires made of high resistance alloys (nichrome, constantan, nickelin, manganin, etc.), there are several simple welding methods without the use of special tools.
Method 1. The ends of the welded wires are peeled, twisted and a current is passed through them with such a force that the junction glows red. A piece of lapis (silver nitrate) is placed in this place with tweezers, which melts and welds the ends of the wires.
Method 2.If the diameter of the high-resistance alloy wire to be welded does not exceed 0,15-0,2 mm, then a thin copper wire (0,1-0,15 mm in diameter) is wound around its ends, and the insulation can not be removed from the rheostatic wire. Then the wires connected in this way are brought into the flame of the burner. At the same time, copper begins to melt and firmly connects both rheostatic wires. The remaining ends of the copper wire are cut off, and the weld is insulated, if necessary. This method can be used to connect copper wires to wires made of high resistance alloys.
Method 3.A burnt-out winding wire of a rheostat or a heater can be connected in the following way: the ends of the wire at the break point are pulled out by 15-20 mm and cleaned to a shine with sandpaper. Then a small plate is cut out of sheet steel or aluminum, a sleeve is made from it and put on the wires at the junction. The wires are pre-fastened with a regular twist. Then the coupling is tightly compressed with pliers. The connection of wires with a coupling provides a sufficiently high mechanical strength, but the contact at the junction is not always reliable, and this can lead to local overheating of the wire and its burnout.
Publication: cxem.net
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