1853
Thus , the main objective of this paper is to review the main NDT techniques and assess the capability of detecting WAAM defects , for inspection either in a monitoring , in-process or post-process scenario .
 NDT, WAAM, defects, inspection, post-process
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:
 NDT, WAAM, defects, inspection, post-process