Welded Pipe Run Production for Zero-Waste Cut Lengths

The pipe production process is segmented into two distinct stages: first, pipe parts of standard length are welded together to form a continuous pipe run; second, the required pipe lengths are cut from this continuous run. This segmentation allows the welding process to operate at optimal standard lengths while the cutting process provides the required length flexibility, eliminating material waste that would occur if standard-length pipes were simply pieced together with gaps or overlaps.

The pipe parts are welded together in advance to form a continuous pipe run before the final cutting to required lengths is performed. This preliminary welding action creates a continuous material supply that can then be cut to any required length without generating waste, as the cutting process can precisely match the required pipe lengths from the continuous run.

Instead of using expensive corrosion-resistant pipe materials or complex passivation processes, the invention applies a polymer coating to the inner surface of ordinary steel pipes. This coating acts as a protective barrier against corrosion, allowing the use of cheaper, non-corrosion-resistant base materials while achieving the required corrosion protection through the coating layer.

The pipe system becomes a composite structure combining the steel pipe base material with a polymer coating layer. This composite approach allows the steel pipe to provide structural strength while the polymer coating provides corrosion resistance, achieving both requirements at lower cost than using inherently corrosion-resistant materials.