9408
It is assumed that bonding is due to athermal plastic deformation of surface asperities and the associated growth of metallic junctions along the weld interface .
 bonding, athermal plastic deformation, surface asperities, metallic, junctions, weld, interface
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 bonding, athermal plastic deformation, surface asperities, metallic, junctions, weld, interface