Today we will learn about types of welding flames used in
gas welding. In my last post, we have discussed about gas welding. In this
welding process gases fuels are burn and produce high temperature flames which
further used to create weld joint. The flame plays lead role to create weld
joint and the weld properties are highly depended on it. There are three types
of flames natural flame, carburizing flame and oxidizing flame. Natural flame
has synchronized mixture of fuel and oxygen, carburizing flame has more fuel
and oxidizing flame has more oxygen. Different material used different flames
according to weld condition.
Types of flame:
As we know there are three basic welding flames. These are
as follow.
Natural Flame:
As the name implies, this flame has equal amount of oxygen
and gases fuel by the volume. This flame burns fuel completely and does not
produce any chemical effect on metal to be welded. It is mostly used
for welding mild steal, stainless steel, cast iron etc. It produces little smoke. This flame has two zones. The inner zone has white in color and has temperature about
3100 degree centigrade and outer zone has blue color and have temperature about
1275 degree centigrade.
Carburizing Flame:
This flame has excess of fuel gas. This flame chemically
reacts with metal and form metal carbide. Due to this reason, this flame does
not used with metal which absorb carbon. It is smoky and quiet flame. This
flame has three regions. The inner zone has white color, the intermediate zone
which is red in color and outer cone has blue color. The inner cone temperature
is about 2900 degree centigrade. This flame is used to weld medium carbon
steel, nickel etc.
Oxidizing Flame:
When the amount of acetylene reduces from natural flame or
amount of oxygen increases, the inner cone tend to disappear and the
flame obtain is known as oxidizing flame. It is hotter than natural flame and
has clearly defined two zones. The inner zone has very bright white color and
has temperature of about 3300 degree centigrade. The outer flame has blue in
color. This flame is used to weld oxygen free copper alloy like brass, bronze
etc.
This is all about types of flames used in welding. If you
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