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A three-dimensional weak coupling modeling method of the arc and metal transport is developed to simulate the arc , molten pool dynamic and droplet impingement in arc welding based additive manufacturing .
 three-dimensional, modeling, arc, metal transport, arc, molten pool, dynamic, droplet, arc welding, additive manufacturing
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 three-dimensional, modeling, arc, metal transport, arc, molten pool, dynamic, droplet, arc welding, additive manufacturing