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The sintering behavior of Cu-Sn nanoparticles during welding process attributes to the formation of transition zone with homogenous microstructure , resulting to the improvement of hardness property and lap-shear strength of spot-welded joints .
 sintering, Cu-Sn nanoparticles, welding, process, transition, microstructure, hardness, lap-shear strength, spot-welded joints
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:
 sintering, Cu-Sn nanoparticles, welding, process, transition, microstructure, hardness, lap-shear strength, spot-welded joints