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The processes of ultrasonic spot welding and ultrasonic additive manufacturing are modelled by approximating the weld interface as rough metallic surfaces in sliding contact .
 concept or principle: processes; manufacturing process: ultrasonic spot welding; manufacturing process: ultrasonic additive manufacturing; engineering feature: weld; concept or principle: interface; material: as; material: metallic; application: contact
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: processes, ultrasonic spot welding, ultrasonic additive manufacturing, weld, interface, as, metallic, contact 
Answer:
 concept or principle: processes; manufacturing process: ultrasonic spot welding; manufacturing process: ultrasonic additive manufacturing; engineering feature: weld; concept or principle: interface; material: as; material: metallic; application: contact