Soldering nichrome and aluminum. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Soldering nichrome and aluminum. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies

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I want to share my experience in soldering aluminum and nichrome (more precisely, welding nichrome). Aluminum can be soldered as follows: a small piece of zinc is taken and the tip of a well-heated soldering iron (mechanically peeling off the oxide layer from aluminum with it, i.e. the tip) "tins" the aluminum. The melting point of zinc is about 400 degrees Celsius, so you need a powerful soldering iron. Then, using ordinary solders (POS-40, POS-60, etc. with a melting point of 220-260 degrees Celsius), we carry out ordinary soldering with aluminum "tinned" with zinc.

I read this secret in the magazine "Devices. Technique. Experiment" I do not remember what year. And with nichrome the following: we twist both ends of the wire and using an ordinary carbon brush from the electric motor "weld" both ends into a ball. As a "welding machine" you can use a transformer of 3-12 Volts and a current of at least 3 Amperes. If it is not at hand, then you can use a powerful load (at least 1 kW) and a 220 volt network.

Observing the precautions, we connect one output of the transformer (or a 220 volt network, always in series through the load) to the twisted wires (closer to the end of the twist), and connect the second output to the brush. Then we touch for a short time the ends of the twist. A bright flash and the wires are "welded". True, a neat ball may not work out the first time, but if you practice a little, then everything will work out. You can weld any (not only nichrome) wires, as well as their various combinations.

Publication: cxem.net

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