Electric-Welded pipes and profiles
A tube is a hollow cylindrical or profiled object with a length that exceeds its cross-section. With a relatively light weight, tubes have a high polar moment of inertia to resist bending and torsion. They are made of metal, plastic, concrete, glass or ceramics. Those made of steel and non-ferrous metals are primarily round or can be profiled to have a square, rectangular or elliptical cross-section. Steel tubes are produced as welded or seamless.
Formed profiles are metal goods of a certain shape obtained by cold-forming coils, strips or steel sheets on roll-forming and bending machines. Such equipment can make both long products (channels, angles, Z-, C-and U-shaped profiles, etc) and various corrugated sheet ones. Compared with similar hot-rolled and stamped metal products, formed profiles have more accurate dimensions and an optimal distribution of metal over the cross-section. This reduces the weight of final structures and products, as well as time and labour costs.