Production of thermite welding electrodes
What should be done if, for example, when repairing a garage or building a fence, we need to weld two steel corners? And, of course, there is no possibility to use either gas welding or electric welding. In this case, you can make a thermite pencil and use it to solve a possible problem without much difficulty.
Termite pencil is a piece of wire from ordinary carbon steel, which is applied to thermite, steeply mixed with glue. (Glue is better to take nitrocellulose - it dries faster). The diameter of the wire (2-5 mm) depends on how massive the parts to be welded are: the more massive they are, the thicker the wire is needed. The composition of termite includes sawdust aluminum (not silumin!) - 23% (by weight) and iron oxide powder - 77%. The particle size of aluminum and scale should be about 0.5 mm.
At the end of a thermite pencil, a seed is applied - a “match head”, which consists of bertolet salt (KClO3) and small aluminum sawdust in a ratio of 2: 1 (by mass) mixed with glue. Priming is needed to ignite a termite.