Welding gas "MAF"

What's it?

The abbreviation "MAF" stands for the methylacetylene-allene fraction after the initial letters of the components of the mixture. MAF is a mixture of several gases and was developed as a substitute for acetylene. MAF is used in all processes of gas-flame processing of metals. More information is in the section.

"Application".

Cylinders of various materials are available:

Steel

Баллон МАФ

Cylinder capacity:

5 , 10 , 20 , 50 , 80 , 120 L

Composite

Баллон МАФ

Cylinder capacity:

5 , 10 , 20 , 50 L

Special burners for working with a mixture of MAF

Горелка

Wholesale and retail
supply of gas MAF

Reduced costs for gas-flame processing of metals

Горелка

Wholesale and retail
supply of gas MAF

Reduced costs for gas-flame processing of metals

Горелка

Wholesale and retail
supply of gas MAF

Reduced costs for gas-flame processing of metals

Technical information

MAF (methylacetylene-allene fraction) is a product of petrochemical production. The main combustible components that determine the properties gas MAF, are methyl acetylene (propine, CH3-C = CH) and allene (propadiene, CH2 = C = CH2) in the amount of 65-75%, as well as propane (H3C-H2C-CH3) and propylene (H3C-CH = CH2) in a total amount of from 30-35 to 20-25%, impurity hydrocarbons (butane, butylene, butadiene) - 0.5-1.5%.

The specified quantitative composition of the mixture is determined by experimental study of the explosiveness of IAF. Because methylacetylene and Allen prone to explosive decay, their content in the gas MAF is limited 75% (in the amount of C3H4). The presence of propane, propylene and hydrocarbons in the amount of at least 25% reduces the explosiveness of the gas MAF, and fire and to explosive properties, it becomes similar to propane. This gas composition it is normalized by technical conditions on which make industrial MAF. Working conditions with him, transportation and storage of gas MAF comply with applicable requirements and regulations for liquefied gases (propane).

The flame of a mixture of MAF, like any hydrocarbon flame, can be carburizing, neutral, oxidizing. Carburizing the flame is obtained (in ideal laboratory conditions) with the oxygen consumption to LFA consumption is about 2.2 or lower (For reference: when burning, approximately one part of the oxygen is taken from the cylinder, the rest - from the surrounding air) carburizing or "reducing" flame is used for welding easily oxidizing alloys, such as aluminum alloys.

By increasing the supply of oxygen or reducing the supply of combustible gas the carburizing flame disappears and this moment of the oxygen consumption ratio to the consumption of combustible gas is 2.3: 1

The inner core of the flame is blue, it is the neutral flame of a mixture of MAF, used for welding low carbon steel. At the same time the flame remains neutral as long as the ratio in the combustible mixture is 2.5: 1 The ratio of gases in the combustible mixture (with the appropriate experience of the welder) can be set according to the appearance of the flame, and power - according to the heating rate before melting of the base metal, the depth of its penetration, the form of a liquid the fluidity of the weld pool, which should have a mirror surface with the minimum amount of slag melting filler wire should occur calmly without significant splashing and sparks. With increasing oxygen supply, an oxidizing blue flame is formed with elongated core and loud burning sound, least suitable for operation, for with the exception of such works as, for example, welding and brazing of copper and its alloys. You should know that, in principle, the core of even a neutral flame when using a mixture of MAF 1.5-2 times longer than acetylene.

The flame temperature of the mixture of MAF, as mentioned earlier, is somewhat lower. temperature of acetylene-oxygen flame, therefore, to obtain the same penetration of metal, the thermal power of the flame gas of the MAF in mixtures with oxygen may be increased.

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