Classification According to Purpose of Welding
A distinction is made between joint and build-up welding.
Joint welding is the creation of a permanent joint between two or more work pieces by means of welding
There are only the following types of joint in welding technology:
Butt welds, Fillet welds, Other joints
The type of joint is e.g. determined by:
Type of welded seam, Type and extent of preparation, e.g. type of joint, Material, Welding process
Build-up welding is the generation of a coat of metal on a work piece by welding in order to obtain desired properties and dimensions.
If basic and build-up material are dissimilar, a distinction is drawn between:
Build-up welding of armouring
Build-up of a material that is preferably more wear-resistant with respect to the basic material
Build-up welding of plating
Build-up of a material that is preferably chemically more resistant with respect to the basic material
Build-up welding of buffer layers
This is to achieve fit-to-purpose bonding between the materials.
Classification according to the physical process of welding
In this case it is distinguished between pressure and fusion welding. Pressure welding is welding by using pressure whereas fusion welding, as welding with limited local welding current, takes place without using any pressure. Filler materials can be used for both processes.
Welding in which sufficient external force is applied to cause a greater or lesser degree of plastic deformation of both the faying surfaces, generally without the addition of filler metal.
Note: Usually, but not necessarily, the faying surfaces are heated in order to permit or to facilitate unifying.
Classification According to the Degree of Mechanisation
The welding processes can also be distinguished by the degree of mechanisation. The following chart shows this for the two fusion welding processes TIG and gas-shielded metal arc-welding.
Automatic welding with welding jib crane