198
Firstly , based on the metal droplet kinetics and weld bead geometry , two different Gas Metal Arc Welding ( GMAW ) metal transfer modes , namely short circuit transfer and free flight transfer , were evaluated for the multi-directional wire arc additive manufacturing .
 material: metal; concept or principle: droplet; process parameter: weld bead geometry; manufacturing process: Gas Metal Arc Welding; manufacturing process: GMAW; material: metal; manufacturing process: wire arc 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:
 material: metal; concept or principle: droplet; process parameter: weld bead geometry; manufacturing process: Gas Metal Arc Welding; manufacturing process: GMAW; material: metal; manufacturing process: wire arc additive manufacturing