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The welding rotation speeds of 800 , 900 and 1000 rpm for giving welding speed of 100 mm/min were used in the additive manufacturing processes of 2195-T8 aluminum-lithium alloy , in which the optimum microstructure is obtained with the rotation speed of 800 rpm .
 manufacturing process: welding; manufacturing process: welding; manufacturing process: additive manufacturing processes; material: alloy; concept or principle: microstructure
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: welding; manufacturing process: welding; manufacturing process: additive manufacturing processes; material: alloy; concept or principle: microstructure