1508
6 Discussion Improving process stability , eliminating or decreasing deposition defects and producing components with high quality and mechanical performance have become major research focuses in making the WAAM process more competitive against other additive manufacturing methods .
 concept or principle: process; machanical property: deposition defects; machine or equipment: components; concept or principle: quality; application: mechanical; concept or principle: research; manufacturing process: WAAM; concept or principle: process; manufacturing process: additive manufacturing
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:
 concept or principle: process; machanical property: deposition defects; machine or equipment: components; concept or principle: quality; application: mechanical; concept or principle: research; manufacturing process: WAAM; concept or principle: process; manufacturing process: additive manufacturing