In this welding process, various types of gases are burnt in combination with oxygen and the flame is applied at the edge of metal plates to be joined. The heat of combustion of the gas melts the metal; filler material may or may not be applied to fill the groove. The molten metal fills the groove which after complete fusion and solidification forms a strong joint. External pressure may or may not be applied at the joint.
The different types of gases used in gas welding are as follows:
- Acetylene
- Hydrogen
- Methane
- City gas
- Natural gas, etc.
The most commonly used gas is acetylene, as acetylene gives highest flame temperature because of its high calorific value.
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