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The present study investigates the use of powder laser metal deposition ( p-LMD ) and wire-arc additive manufacturing ( WAAM ) for hybrid manufacturing of Ti-6Al-4V aerospace forgings .
 concept or principle: investigates; material: powder; manufacturing process: laser metal deposition; manufacturing process: wire-arc additive manufacturing; manufacturing process: WAAM; concept or principle: hybrid manufacturing; material: Ti-6Al-4V; application: aerospace
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:
 concept or principle: investigates; material: powder; manufacturing process: laser metal deposition; manufacturing process: wire-arc additive manufacturing; manufacturing process: WAAM; concept or principle: hybrid manufacturing; material: Ti-6Al-4V; application: aerospace