Welding Process - Gas Welding Process

Gas welding process is a joining process of two similar or dissimilar metal by using flame which is generated by mixture of gases. These flame melt the workpiece and join metal parts. 

Gas welding process is also known as Oxyacetylene welding because it uses Oxygen (O2) and Acetylene (C2H2) as a mixture of gases to generate flame that melt and fused the metal. The black cylinder is used to store Oxygen (O2) and Maroon Colour Cylinder is used to Store Acetylene (C2H2).

Gas Welding Process

The process of welding is almost same in each welding like to melt the two metal by heating above the melting point (add flux or filler material if required) and fuse them. Aluminium, Nickel and Stainless steel are some filler material used in Gas welding process (if required).

Gas Welding Process

In Gas welding process the metal is melt by heating mixture of fuel gases like Acetylene and Oxygen. When these high pressure gases are released from the cylinder they flew into the torch. These gases has high temperature when ignite by an external spark. This flame is used in welding process. The flame can be control by the use of cylinder where gases is stored. To increase the flame one need to increase the pressure of gases through the cylinder and vice versa. 

Gas Welding Equipment

Regulator : 

Regulator is used to control the pressure of gases to flow for operation

Non return valve : 

Non return valve is used to prevent the gases to flow back to the cylinder.

Torch : 

Torch is a working tool which is used to make the gas welding process by release gases flame to the metal.

Type of Flame in Gas Welding

There are three types of flame generated in Gas welding

• Carburising Flame

• Neutral Flame

• Oxidising Flame

Carburising Flame : 

In Carburising flame the Acetylene gases is more than Oxygen. It is used to weld high carbon steel and cast iron.

Neutral Flame : 

In neutral flame the Acetylene gases and the Oxygen are present in equal proportion. It is used to Cast iron, Stainless steel, copper, aluminium and mild steel.

Oxidising Flame : 

In Oxidising flame the flow of oxygen is more than Acetylene. These flame has highest temperature which is used to weld brass, iron carbide and ferrous metals.

Gas Welding Equipment

Gas Welding Advantage

• Gas Welding doesn't required electricity.

• Gas Welding equipment is cheap and portable.

• This method is suitable for ferrous and non ferrous metals.

• Easy to maintenance and repair

Gas Welding Disadvantage

• Gas welding is not suitable for high speed steel (titanium and zirconium) becuase it change mechanical properties of metal.

• It offer less penetration as compared to other welding process like MIG or TIG welding.

• This method suitable for thin sheet metal but not suitable for thick sheet metal.

• After completion of welding process there is large affected are