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2 Wire arc additive manufacturing systems 2.1 Classification of WAAM process Depending on the nature of the heat source , there are commonly three types of WAAM processes : Gas Metal Arc Welding -based , Gas Tungsten Arc Welding -based and Plasma Arc Welding -based .
 manufacturing process: Wire arc additive manufacturing; concept or principle: Classification; manufacturing process: WAAM; concept or principle: process; concept or principle: heat source; manufacturing process: WAAM; concept or principle: processes; manufacturing process: Gas Metal Arc Welding; manufacturing process: Gas Tungsten Arc Welding; manufacturing process: Plasma 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:
 manufacturing process: Wire arc additive manufacturing; concept or principle: Classification; manufacturing process: WAAM; concept or principle: process; concept or principle: heat source; manufacturing process: WAAM; concept or principle: processes; manufacturing process: Gas Metal Arc Welding; manufacturing process: Gas Tungsten Arc Welding; manufacturing process: Plasma Arc Welding