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Additive manufacturing of metals is an innovative near-net-shaped manufacturing technology used for producing final solid objects by depositing successive layers of material melted in powder or wire form using a focused heat source directed from an electron beam , laser beam , or plasma or electric arc .
 manufacturing process: Additive manufacturing; material: metals; manufacturing process: manufacturing technology; material: material; material: powder; concept or principle: heat source; concept or principle: electron beam; concept or principle: laser beam; concept or principle: plasma; process parameter: electric 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; material: metals; manufacturing process: manufacturing technology; material: material; material: powder; concept or principle: heat source; concept or principle: electron beam; concept or principle: laser beam; concept or principle: plasma; process parameter: electric arc