Spiral welded pipes are produced from coils of steel that are unwound and flattened. The flattened strip is formed by angled rollers into a cylinder of the desired diameter. At the end of the coil, a new coil is butt-welded to the trailing edge of the pipe, forming a cross seam.
A G Universal Limited is a supplier and manufacturer of high quality Spiral Welded Steel Pipes in India. We manufacture Spiral Welded Pipes in different sizes, grades and specification as per international guidelines as we also export our products in many countries. Spiral welded pipes are manufactured from coils of steel which are unwound and flattened. The flattened strip is formed by angled rollers into a cylinder of the desired diameter. Spiral welded pipes are available in sizes from 24 inches to 144 inches.
Spiral welded pipes are also known as helical welded pipes. They are mainly used for water distribution service. They are used in many types of industries such as tap water engineering, chemical industry, electric power industry, petrochemical industry, agricultural irrigation and construction.
Like ERW pipe, spiral welded pipe is also manufactured from steel coil but the only difference is that the coil is wound at an angle, so the weld runs around the outside of the pipe in the shape of a helix. Spiral welded pipes are also known as helical welded pipes. The manufacturing process of spiral welded pipe is one of the most cost-effective ways to produce steel pipes. It typically utilises a helical Double Submerged Arc Weld (DSAW), which is protected against outside contaminants in the air, thus keeping the welded steel purified. Our mill produces a wide range of pipe diameters and wall thicknesses.
HR Coils are loaded on the decoiler of the Spiral Pipe Mill. The strip is straightened and the 100% coil is examined for any defects in the material by an automatic ultrasonic unit having 36 probes and 144 channels. The edges are refined to desired joint geometry. The strip is guided into the forming station, where it is formed to produce a cylindrical hollow body at a predetermined forming angle, ensuring the proper welding gap between the adjoining edges. Later, inside and outside welding is performed by an automatic submerged arc process.
After accomplishment of inside and outside welding, flux and slag from inside the pipes are cleaned. Pipes are cut to a predetermined length by an automatic plasma arc cutting device. The entire weld seam is scanned by Fluoroscopic Inspection/Real Time Radiography for analysis of the weld defects, if any. At the end facing machine, both ends of the pipes are machined simultaneously, to suit joint, to be used on the pipeline. Each pipe is hydrostatically tested to a given pressure as per API 5L specification or other desired specification.
An 100% weld length and HAZ of each pipe is examined by an automatic ultrasonic unit with the help of 16 probes and 16 channels for detecting the defects, if any. At the X-ray station, radiographs are taken from the weld seam of each pipe end up to a distance of 4″. Every length of pipe is subjected to a rigorous check at the final stage before it is accepted by the Quality Control Department.