Classification of Welding:
Welding means the process of joining two metal parts together to give a sound and strong joint. The welding process is subdivided into two main classes.
1. Fusion welding, which involves heating the ends of metal pieces to be joined to a temperature high enough to cause them to melt or fuse and then allowing the joint to cool. This process is somewhat similar to casting process. The joint, after the fused metal has solidified will result in a strong joint.
2. Pressure welding, which involves heating the ends of metal pieces to be joined to a high temperature, but lower than their melting point and then keeping the metal pieces joined together under pressure for sometime. This results in the pieces welding together to produce a strong joint.
There are many subclassifications of welding under each head. Subclassification is done according to the source of heat required for fusion or pressure welding. We shall deal with but three of them
(a) Gas welding
(b) Electric arc welding, and
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