Hot dip galvanized unipolar telecommunications tower Welding The welding conforms to AWS D1.1 standard. CO2 welding or automatic submerged arc welding method No cracks, scars, overlap, delamination or other defects Internal and external welding makes the shape of the magnetic pole more beautiful... https://www.db-steel-tower.com/wireless-towers/portable-tower-systems/hot-dip-galvanized-unipolar.html