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The focus in this paper is the feasibility of large-scale AM of metallic materials by arc welding .
 concept or principle: feasibility; manufacturing process: AM; material: metallic materials; manufacturing process: arc welding
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:
 concept or principle: feasibility; manufacturing process: AM; material: metallic materials; manufacturing process: arc welding