If the construction surface is flat and open with few turns and dead angles, then the welding rods will be saved. The creeping welding machine will not use welding rods on the flat surface. The welding rod is used in uneven surface on which creeping welding machine can not be used.
I can not tell you precisely how many welding rods are needed as it is related to the terrain of your project, soil environment, and design. Based on simple estimation, it seems that 35 or 36 kilograms of rods are needed.
