All the tubes , whose sections are determined according to the tension and compression forces as per the design calculations can be both seamed or seamless tubes from S235JR (St 37-2), S275 JR(St 44-2), S355J2G3 (St 52-3) quality steel sheets with high weldability property confirming to EN10025 standards.

Tubes produced in confermence to DIN 2440, DIN 2441, DIN 1626 , EN 10219 Standards are chosed from 26.9 mm to 324 mm according to the design calculations .

Hot forged or machined cones of the same quality of the tubes are welded to each sides by semi automatic gas shielded arc welding process.