To make a suitable economic approach to implement a VIGILAWELD in a robotic cell we must know  the number of daily pieces manufactured , the liters consumed by  piece  , and the gas cost  . An automotive type cell produces around 1000 pieces per day, about 15 liters piece  ,   and 1 or 6 €  cost of the m3 of gas if it is of bulk or bottle respectively.
With this data  the daily savings can oscillate between from 7 to 40 € .