Fusion welding: Melting together – with or without a filler – of materials which as they solidify give rise to a single part.
Solid-state welding: Welding occurs without melting of the involved materials (no filler is typically used).
Theory and Application
In the following, the most relevant welding processes will be briefly described. First, common classifications of the welding operations are provided, following what is already mentioned in the definition section, as part of the wider concept of Joining. The traditional welding processes are subdivided into fusion and pressure welding processes, the latter indicating processes in which both fusion is obtained and pressure is applied. Furthermore, the welded joints are classified on the basis of the mutual position of the blanks to be welded (butt joints, lap joints, T-joints, and so on) and – in the cases of manual processes – on the position of the joint to be welded with respect to the...
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