9377
Significant tool wear is observed at lower tool rotation speeds , resulting in lower weld strength .
 tool wear, tool rotation speeds, weld strength
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:
 tool wear, tool rotation speeds, weld strength