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The bypasB-coupled wire arc additive manufacturing ( WAAM ) process was studied , and the arc characteristics and droplet transfer behavior during the deposition process were examined .
 manufacturing process: wire arc additive manufacturing; manufacturing process: WAAM; concept or principle: process; concept or principle: arc; concept or principle: droplet; manufacturing process: deposition process
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: wire arc additive manufacturing; manufacturing process: WAAM; concept or principle: process; concept or principle: arc; concept or principle: droplet; manufacturing process: deposition process