1053
Additive manufacturing employing Gas Tungsten Arc ( GTA ) as the heat source is capable of fabricating fully dense metal components layer upon layer .
 manufacturing process: Additive manufacturing; concept or principle: Gas; concept or principle: Arc; material: as; concept or principle: heat source; manufacturing process: fabricating; material: metal; machine or equipment: components; process parameter: layer
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: Additive manufacturing; concept or principle: Gas; concept or principle: Arc; material: as; concept or principle: heat source; manufacturing process: fabricating; material: metal; machine or equipment: components; process parameter: layer