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Wire arc additive manufacturing ( WAAM ) is a metal additive manufacturing process based on gas metal arc welding and it is known to be economically convenient for large metal parts with low complexity .
 manufacturing process: Wire arc additive manufacturing; manufacturing process: WAAM; manufacturing process: metal additive manufacturing; manufacturing process: gas metal arc welding; material: be; material: metal; concept or principle: complexity
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; manufacturing process: WAAM; manufacturing process: metal additive manufacturing; manufacturing process: gas metal arc welding; material: be; material: metal; concept or principle: complexity