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The main objective of this work is to show the first experiences in the development of a cost effective metal additive manufacturing system on the basis of gas metal arc welding ( GMAW ) .
 manufacturing process: metal additive manufacturing; manufacturing process: gas metal arc welding; manufacturing process: GMAW
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: metal additive manufacturing; manufacturing process: gas metal arc welding; manufacturing process: GMAW