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The Al wire was fed in TOP-TIG welding mode but the Ti6Al4V wire was fed in conventional TIG welding mode .
 Al, welding, Ti6Al4V, TIG welding
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 Al, welding, Ti6Al4V, TIG welding