Methods of Welding
There are five following methods of welding:-
i) Forge Welding
ii) Thermit Welding
iii) Gas Welding
iv) Electric Arc Welding
v) Resistance Welding
i) Forge Welding:-
In this method of welding, the ends of metal pieces which are to be joined are heated to a molten stage (plastic stage) and then with the help of external mechanical force they are joined to form a rigid joint.
ii) Thermit Welding:-
The term thermit indicates about the chemicals used for welding which consists of a powder of Iron Oxide and Aluminium. The mixture of iron oxide and aluminium is kept at the joint and then it is ignited as result, a chemical reaction takes places where iron oxide is reduced to iron which gets deposited at the joint and the aluminium oxide is removed off after cooling. This method is mainly adopted for railway track at the site.iii) Gas Welding:-
In this method, two separate cylinders consisting of oxygen and acetylene gas are used at the site. with the help of two separate tubes, gases are combined and it is ignited. A blue flame is produced a welding rod or metal piece is kept in front of the flame so that it gets melted and deposited at the joint.iv) Electric Arc Welding:-
It is the most widely adopted method of welding of structural steel. An electric arc is produced with the help of current and then a welding rod gets melted and deposited at the joint.
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