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This study presents investigations on the additive manufacturing of hot work steel with the energy-reduced gas metal arc welding ( GMAW ) process , which is a cold metal transfer ( CMT ) process .
 manufacturing process: additive manufacturing; material: hot work steel; manufacturing process: gas metal arc welding; manufacturing process: GMAW; concept or principle: process; manufacturing process: cold metal transfer; manufacturing process: CMT; concept or principle: process
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: hot work steel; manufacturing process: gas metal arc welding; manufacturing process: GMAW; concept or principle: process; manufacturing process: cold metal transfer; manufacturing process: CMT; concept or principle: process