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During fabrication , the robot and external axis provide accurate motion for the welding torch to build up the component in a layer-by-layer fashion .
 manufacturing process: fabrication; machine or equipment: robot; process characterization: accurate; machine or equipment: welding torch; process parameter: build; machine or equipment: component; concept or principle: layer-by-layer fashion
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: fabrication; machine or equipment: robot; process characterization: accurate; machine or equipment: welding torch; process parameter: build; machine or equipment: component; concept or principle: layer-by-layer fashion