Gas Welding and Types of flames

Primary reaction:

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C_2+H_2\: \to \: 2CO+H_2+\Delta H_1

Secondary Reaction:

 2CO+H_2+\frac 3 2O_2 \: \to 2 CO_2+H_2O+\Delta H_2

 C_2H_2+\frac 5 2 \:O_2 \: \to 2 CO_2+H_2O+\Delta H

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gaswelding

  • While burning the acetylene in the presence of . Due to the exothermic reaction heat is released, which is useful for melting of the material to produce a fusion joint
  • For complete combustion of 1 mole of acetylene 2.5 moles of oxygen is required in which one mole is supplied from oxygen cylinder and 1.5 moles is consumed from atmosphere
  • By controlling the flow rates of oxygen and acetylene different flames are produced, which are used for different applications.
  • Due to primary reaction carbon monoxide is formed by releasing some amount of heat, due to which the inner cone is produced that has max temperature.
  • Due to instability, carbon monoxide will react with oxygen present in the atmospheric, which produces a stable form of carbon dioxide by releasing some heat in secondary reaction.
  • Due to this heat, outer blue flame is produced by covering more area, as it has less temperature when compared to inner core.
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Types of flames:

Types flame

Neutral flame:

It is used for general purpose application for welding of mild steel, low carbon steels, alloy steels and cast iron.

Oxidizing:

This flame is used for the copper, zinc, bronze and brass.

Carburizing:

This process is used for high carbon steel, cast iron, aluminum and nickel based alloys.

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