Yes, aluminum coil can be used for welding. It is commonly used as a filler material in processes like MIG (Metal Inert Gas) welding, where it is fed continuously into the weld pool to create a joint. Aluminum welding requires specific techniques and equipment due to its high thermal conductivity and the need to prevent oxidation. The aluminum coil must be of high quality and clean to ensure a strong, corrosion-resistant weld.