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Magnetic Arc Oscillation was applied during the construction of single-pass multi-layer walls of low carbon steel and Ti6Al4V by the Gas Tungsten Arc Welding-based Wire and Arc Additive Manufacturing process , and the influence on the geometry and the process stability was evaluated .
 concept or principle: Arc; application: construction; material: low carbon steel; material: Ti6Al4V; concept or principle: Gas; concept or principle: Arc; manufacturing process: Wire and Arc Additive Manufacturing; concept or principle: process; concept or principle: geometry; concept or principle: process
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:
 concept or principle: Arc; application: construction; material: low carbon steel; material: Ti6Al4V; concept or principle: Gas; concept or principle: Arc; manufacturing process: Wire and Arc Additive Manufacturing; concept or principle: process; concept or principle: geometry; concept or principle: process