Welding can be defined as the art or process of joining metals by amalgamating the ends of the two pieces of metals. Primarily used for metals, welding is also done to join thermoplastics. It is indeed the basis of any fabrication the world over. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces.
In welding, three main ingredients are required to join metals together.
1. An electrical power source to produce an arc. This is required to melt the metal.
2. Some form of shielding to protect the weld from the air. This is because the gaseous inclusion in the weld melt makes the welded area brittle and therefore weak.
3. Filler material to fill the weld joint.
There are various processes in which welding takes place. Broadly, they are as under.
1. Arc welding
For details about each welding type, click on them.
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