1501
Both techniques are cold mechanical treatments that impact the weld surface using high energy media to release tensile stress by imposing compressive stress at the treatment surface .
 manufacturing process: cold mechanical treatments; concept or principle: impact; process characterization: weld surface; machanical property: tensile stress; machanical property: compressive stress; concept or principle: surface
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: cold mechanical treatments; concept or principle: impact; process characterization: weld surface; machanical property: tensile stress; machanical property: compressive stress; concept or principle: surface