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In this work , the layer bonding of AA6082 samples produced by this process has been investigated by means of tensile testing , hardness measurements and microscope analyses .
 process parameter: layer; concept or principle: bonding; concept or principle: samples; concept or principle: process; process characterization: tensile testing; machanical property: hardness; machine or equipment: microscope
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:
 process parameter: layer; concept or principle: bonding; concept or principle: samples; concept or principle: process; process characterization: tensile testing; machanical property: hardness; machine or equipment: microscope