Neutral Flame:
-A neutral flame is produced when approximately equal volume of oxygen and acetylene are mixed in the welding torch and burnt at the torch tip.
-The temperature of the neutral is of the order of about 3260 degree Celsius.
-The flame has a nicely defined inner core which is light blue in color. It is surrounded by an outer flame envelop produced by the combination of oxygen in the air and superheated carbon monoxide and hydrogen gases from the inner cone.This envelop is usually a much darker blue than the inner cone.
-A neutral flame is named so because it effects no chemical change in the molten metal and therefore will not oxidize or carburize the metal.
-The neutral flame is commonly used for the welding at:
1) mild steel
2) stainless steel
3) Cast steel
4) Copper
5) Aluminum
Oxidizing Flame:
-If after the neutral flame has been established the Oxygen supply is increased to produce Oxidizing flame.
-Oxidizing flame can be observed by the small white cone which is shorter,more bluer and more pointed than the neutral flame.
-An oxidizing flame burns making a roaring sound.and is much hotter than the neutral flame due to excess of oxygen supply causing the temperature to rise up to 6800 degree Celsius
-A slightly Oxidizing flame.is helping welding most metals like (1) Copper-base metal (2) Zinc-base metals
(3) A few types of ferrous metals such as manganese steel and cast iron.
-The Oxidizing atmosphere in these cases creates a base metal oxide that protects the base metal.
Reducing Flame:
If the volume of Oxygen supplied in the metal flame is reduced the reducing flame will be a carburising flame
rich in acatylene.
-A reducing flame can be observed by acetylene feather which exists between the inner cone and the outer envelope.The outer flame envelope is longer than neutral flame an is usually much brighter in color
-A reducing flame does not completely consumes the available Carbon, therefore the burning temperature is
lower and the left over carbon is forced into the molten metal. With iron and steel it produces very hard and brittle substance known as iron carbide.This chemical change makes the metal unsuitable for many applications in which the weld may need to be bent or stretched. Metal that tend to absorb Carbon should not be welded with reducing flame.
-A reducing flame has an approximate temperature of 5500 degree Fahrenheit.A reducing flame may be distinguished from a carburizing flame in the fact that a carburizing flame contains more acetylene than a reducing flame.
-A carburizing flame is used in the welding of lead and for surface hardening process.
-A reducing flame on the other hand does not carburize the metal rather it ensures the absence of oxidizing condition. It is used for welding of low alloy steel and for those metals ( e.g non-ferrous) that do not tend to absorb carbon. This flame is very well used for welding high carbon steels.
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-A neutral flame is produced when approximately equal volume of oxygen and acetylene are mixed in the welding torch and burnt at the torch tip.
-The temperature of the neutral is of the order of about 3260 degree Celsius.
-The flame has a nicely defined inner core which is light blue in color. It is surrounded by an outer flame envelop produced by the combination of oxygen in the air and superheated carbon monoxide and hydrogen gases from the inner cone.This envelop is usually a much darker blue than the inner cone.
-A neutral flame is named so because it effects no chemical change in the molten metal and therefore will not oxidize or carburize the metal.
-The neutral flame is commonly used for the welding at:
1) mild steel
2) stainless steel
3) Cast steel
4) Copper
5) Aluminum
Oxidizing Flame:
-If after the neutral flame has been established the Oxygen supply is increased to produce Oxidizing flame.
-Oxidizing flame can be observed by the small white cone which is shorter,more bluer and more pointed than the neutral flame.
-An oxidizing flame burns making a roaring sound.and is much hotter than the neutral flame due to excess of oxygen supply causing the temperature to rise up to 6800 degree Celsius
-A slightly Oxidizing flame.is helping welding most metals like (1) Copper-base metal (2) Zinc-base metals
(3) A few types of ferrous metals such as manganese steel and cast iron.
-The Oxidizing atmosphere in these cases creates a base metal oxide that protects the base metal.
Reducing Flame:
If the volume of Oxygen supplied in the metal flame is reduced the reducing flame will be a carburising flame
rich in acatylene.
-A reducing flame can be observed by acetylene feather which exists between the inner cone and the outer envelope.The outer flame envelope is longer than neutral flame an is usually much brighter in color
-A reducing flame does not completely consumes the available Carbon, therefore the burning temperature is
lower and the left over carbon is forced into the molten metal. With iron and steel it produces very hard and brittle substance known as iron carbide.This chemical change makes the metal unsuitable for many applications in which the weld may need to be bent or stretched. Metal that tend to absorb Carbon should not be welded with reducing flame.
-A reducing flame has an approximate temperature of 5500 degree Fahrenheit.A reducing flame may be distinguished from a carburizing flame in the fact that a carburizing flame contains more acetylene than a reducing flame.
-A carburizing flame is used in the welding of lead and for surface hardening process.
-A reducing flame on the other hand does not carburize the metal rather it ensures the absence of oxidizing condition. It is used for welding of low alloy steel and for those metals ( e.g non-ferrous) that do not tend to absorb carbon. This flame is very well used for welding high carbon steels.
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