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This paper proposed a fabrication method of producing metallic parts with overhanging structures using the multi-directional wire arc additive manufacturing .
 manufacturing process: fabrication; machine or equipment: metallic parts; concept or principle: overhanging structures; 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:
 manufacturing process: fabrication; machine or equipment: metallic parts; concept or principle: overhanging structures; manufacturing process: wire arc additive manufacturing