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Wire and arc-based additive manufacturing ( AM ) is an additive manufacturing technique applying arc welding technology , where the metal melted by the arc discharge is accumulated and deposited .
 manufacturing process: additive manufacturing; manufacturing process: AM; manufacturing process: additive manufacturing; manufacturing process: arc welding; material: metal; concept or principle: melted; concept or principle: arc
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; manufacturing process: AM; manufacturing process: additive manufacturing; manufacturing process: arc welding; material: metal; concept or principle: melted; concept or principle: arc