Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [processes and techniques by material]
6. [metalworking and metalworking processes and techniques]
7. [metalworking processes and techniques]
8. [metal assembling processes and techniques]
9. welding
10. pressure welding

Anotations

Scope note:

A solid-state welding process in which the parts are joined by the local application of high-frequency sound waves as they are held together under pressure. This process is used in many industrial applications to join dissimilar materials. It is also used in the conservation of parchment, the encapsulation of paper objects, and in joining woven and non-woven textiles.