3305
In order to realize oriented wire and arc additive manufacturing ( WAAM ) featured by low heat input and small droplets , a novel compulsively constricted WAAM ( CC-WAAM ) method was proposed and investigated in this paper .
 wire and arc additive manufacturing, WAAM, heat, droplets, WAAM
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:
 wire and arc additive manufacturing, WAAM, heat, droplets, WAAM