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Thermite Welding Overview

Thermite welding is a process that results from a chemical
reaction that is created through heating metal to a super high temperature
between two reducing agents, one of which will be a metal oxide and the other
aluminum or sometimes other types of reducing agents are used. This can be done
with pressure or without pressure. At this point the liquid metals will produce
a filler metal.

The chemical reaction that is
produced will give off a temperature of 4500 degrees Fahrenheit or 2482 degrees
Celsius. This metal that was created with high heat is found in a crucible that
is part of the weld joint. It is actually above this joint.

This chemical reaction or
exothermic reaction as it is also called, will be slow compared to other
processes; it takes about 20 or 30 seconds and it doesn’t matter how many
chemicals are part of the process — it still takes about the same amount of
time.

When the welder wants to weld two
things together, the two parts are lined up equally but a gap is made between
the two pieces of metal. Before the two pieces of metal are put together there
is a mold that is put between them so that the hot steel can go into the mold.
Because this new metal is hotter than the base metal, the base metal will melt
along the edge of the pieces to be welded.

From the crucible, the hot metal
now allows heat to be lost and this causes the metal that has been melted to
become solid again and a process called coalescence
happens and this completes the weld. In the event that you have larger parts
that need to be welded, you may need to preheat them and this is done inside
the cavity within the mold.  This is done
to bring these larger pieces to the correct temperature for welding and the
process also help to make sure that the mold is dry.

When you have smaller parts, this
preheating is usually not necessary. The mode that is used for thermite welding
is the automatic one which means that once the chemical reaction starts, the
process continues until it is finished.

The process of thermite welding
uses gravity to bring the metal down to the cavity between the two parts
through the gap. This practice of welding is like pouring castings in foundry
type businesses. The basic difference between these two processes is that in
Thermite welding the temperature of melted metal is higher.

After the metal filler cools you
may find extra filler on it and this can easily be removed by using a machine,
grinding it or by using oxygen cutting. However , when the weld is finished you
the finished weld surface is usually very smooth and you don’t have to worry
about doing any finishing.

Thermite Welding is used a lot at the Railroads
to weld the rails together.  A couple of
advantages of this type of welding is that it that it doesn’t need a power
source that is outside of the process because the heat is produced through the
chemical reaction and you can join parts if they are larger and have heavy
sections.

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Tags: amount of time, cavity, chemical reaction, coalescence, correct temperature, crucible, degrees fahrenheit, exothermic reaction, filler metal, high heat, high temperature, hot metal, hot steel, liquid metals, metal oxide, mold, thermite welding, two pieces, welder, welding process

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Tags: amount of time, cavity, chemical reaction, coalescence, correct temperature, crucible, degrees fahrenheit, exothermic reaction, filler metal, high heat, high temperature, hot metal, hot steel, liquid metals, metal oxide, mold, thermite welding, two pieces, welder, welding process