Thermite welding. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Thermite welding. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / welding equipment

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Connecting metal pipes or corners at home is a problematic task. After all, neither gas nor electric welding, as a rule, the majority have. And tin and solder based on it will not withstand serious mechanical loads.

In this case, we advise you to use a thermite pencil, the manufacture of which will not be particularly difficult. It is a rod with a diameter of 2 - 5 mm made of carbon steel and a shell consisting of 23% (by weight) of sawdust or aluminum powder and 77% of iron oxide or iron scale in the form of a powder with the addition of glue. Particles of aluminum and iron oxide should not exceed 0,5 mm.

After thoroughly mixing the components, add nitrocellulose or any quick-drying synthetic glue, bringing the mass to a pasty state.

The shell is done like this. First, a hollow cylinder is rolled up from a sheet of tracing paper measuring 120x40 mm, wrapping a metal rod with paper, or even better, a glass tube that does not have burrs. Before winding, the sheet is smeared with any glue. The inner diameter of the cylinder should be three times the diameter of the rod.

Using a spatula or spoon, fill a paper cylinder with paste, having previously closed one of the holes with a cork. Then a metal rod is inserted into it, trying to install it along the axis of the cylinder. After the shell has hardened, the tracing paper is removed by cutting the paper cylinder with a razor.

Thermite pencil is ready. At home, it is lit from the flame of a gas burner. If it is not there, use a Bengal fire or stock up on an ignition pencil. It is made similar to thermite. Bertolet's salt and aluminum powder or sawdust are used only as a filler in a ratio of 2:1.

When welding, fire safety rules must be strictly observed. Remember, this process is accompanied by splashes of molten metal. Therefore, work with glasses to protect your eyes, and choose clothes that do not burn through.

Author: A.Zakharov

See other articles Section welding equipment.

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