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In this work , the effect of post-weld heat treatments ( PWHT ) on Al-6061 builds fabricated using the UAM process was explored aiming to improve the mechanical strength of the UAM builds .
 manufacturing process: post-weld heat treatments; concept or principle: PWHT; material: Al-6061; concept or principle: fabricated; manufacturing process: UAM; concept or principle: process; machanical property: mechanical strength; manufacturing process: UAM; process characterization: builds
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: post-weld heat treatments; concept or principle: PWHT; material: Al-6061; concept or principle: fabricated; manufacturing process: UAM; concept or principle: process; machanical property: mechanical strength; manufacturing process: UAM; process characterization: builds