SU935232A1 - Thermite composition - Google Patents

Description

(5) COMPOSITION OF TERMIT MIXTURE

I

This invention relates to welding, in particular to the composition of a thermite mixture. There are various thermite mixtures, for example, a composition containing the following components, weight. Aluminum 60-b5

Iron scale15-25 Graphite. 7-15 However, when welding with a known MITOM, a refractory, viscous slag is formed, which is poorly separated from the weld metal.

Closest to the proposed composition is a thermite mixture L containing the following components, wt.%:

Aluminum1-25

Quartz sand 0, Iron oxide. Other. A disadvantage of the known composition of thermite mixture is that the weld metal has insufficient

quality due to the presence of slag impurities.

To improve the quality of the weld metal, the composition of the thermite mixture additionally contains soda in the following ratio of components, weight .. Aluminum 30-0

Iron scale A5-55 Soda1,5-3,0;

Quartz sand Else

10 The introduction of soda soda into the composition of the thermite mixture, which melts to form low-melting compounds with slag oxides, contributes to the improvement of the quality of the weld metal due to the improvement of the separability of the slag crust.

The table shows examples of the thermite mixture.

Example. For welding broken bucket surface use

M thermite mixture of composition, wt.: Metal aluminum 30, iron forge dross 55. soda 3.0 and quartz sand 12.0.

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A pre-disturbed bucket surface is heated with an oxygen torch before, then a thermite mixture is loaded onto this surface, which is ignited from below by an electric arc obtained by touching a welded electrode to the bucket wall, under a layer of thermite mixture. At the same time, the reaction started with metallic aluminum and iron oxide, as a result of which the temperature in the area of the bucket to be repaired increased to. This contributes to the uniform melting of the entire charge and ensures the production of a low-melting liquid swellable slag, which is easily separated from the metal and floats to the surface.

Example 2. For the welding of a damaged bucket surface, a thermite mixture of the composition is used, weight: metallic aluminum 40, forge

iron dross 45, soda 1.5 and quartz sand 13.5 The pre-disturbed bucket surface is heated with an oxygen torch before, then a thermite mix is loaded on this surface, which is ignited from below by an electric arc obtained from touching the welding electrode to the bucket wall, under a layer of ternite mixture. At the same time, the reaction between metallic aluminum and iron oxide started, as a result of which the temperature in the area of the bucket to be repaired increased to 2000 ° C. This contributes to the uniform melting of the entire charge and ensures the production of low-melting, fluid slag, which is easily separated from the metal and floats to the surface.

The application of the proposed termite contributes to the quality of the weld metal.

Claims (1)

Claim The composition of the termite mixture containing aluminum, iron oxide and quartz sand, characterized by the fact that, in order to improve the quality of the metal. The seam, it additionally contains soda in the following ratio, wt.?: Aluminum 30-40 45 Iron oxide .45-55 Soda 1.5-3.0 Quartz sand