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The geometric features were assessed using transverse section macrographs and the effects of different patterns and frequencies of oscillation on the arc characteristics , metal transfer and weld pool behavior during the layer deposition were investigated using high speed and welding cameras .
 concept or principle: arc; material: metal; concept or principle: weld pool; process parameter: layer; concept or principle: deposition; manufacturing process: welding
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; material: metal; concept or principle: weld pool; process parameter: layer; concept or principle: deposition; manufacturing process: welding