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However , parts fabricated using UAM often exhibit a reduction in strength levels when loaded normal to the welding interfaces ( Z-direction ) .
 concept or principle: fabricated; manufacturing process: UAM; concept or principle: reduction; machanical property: strength; engineering feature: welding interfaces; engineering feature: Z-direction
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: fabricated; manufacturing process: UAM; concept or principle: reduction; machanical property: strength; engineering feature: welding interfaces; engineering feature: Z-direction