The growing line is composed by one set of fix type hydraulic fit-up rotator and one set of movable adjustable rotator.
The wind tower body is fit-up and welded at this working station. The first section is placed on the adjustable rotator, the second is put on the hydraulic fit up rotator. After align the two section, by adjusting fit up rotator, spot welding is done by rotate the adjustable rotator. The manipulator complete outside and inside circular welding after fit up. Steps by steps, the sections is connected and grow to the whole line, until the last section with flange is welded.