Classification of welding process based on filler metals

 Based on the application of filler metals, the welding process can also be classified as follows:

(a) Autogeneous:

The process is one in which no filler metal is added to the joint interface.

Example: Electric resistance welding.

(b) Homogeneous:

The process in which the filler metal is added and it is similar to parent metal. 

Examples: Arc welding, electron beam welding and diffusion welding.

(c) Heterogeneous:

The process in which the filler metal is used but it is of different type from the parent metai. Examples: Brazing and soldering.