MUMBAI, India, June 26 -- Intellectual Property India has published a patent application (202617065690 A) filed by Nanjing Dade Steel Pipe Co. , Ltd. on May 25, 2026, for Continuous Production Device And Manufacturing Method For Spiral Welded Steel Pipe Of Combined Structure.
Inventor includes Zhan, Fujun.
The application for the patent was published on June 19, 2026, under issue no. 25/2026.
Abstract: A continuous production device for a spiral welded steel pipe of a combined structure, comprising a delivery mechanism, a spiral rolling mechanism, a guide carrier roller, and a welding mechanism. A first composite steel strip is delivered by the delivery mechanism; a vertical steel strip is rolled outwards into a round shape by the spiral rolling mechanism; the welding mechanism is used for welding a spiral joint between an upper steel strip that has just been rolled into a round shape and the previous section of steel strip which has become a pipe body; a lower steel strip is guided by a guide carrier roller to be attached to the vertical steel strip of the first composite steel strip that has passed through a pilot roller; and when the attachment point passes through a rounding press roller, the joint between the first composite steel strip and the lower steel strip is welded by means of the welding mechanism, achieving continuous spiral rolling and welding. The welding point between the first composite steel strip and the lower steel strip is located behind the rounding press roller, that is, behind a plastic deformation point of the first composite steel strip; in this case, the first composite steel strip has completed plastic deformation in the rolling process, and the lower steel strip does not need to be stretched when being rolled, thereby avoiding tensile deformation.
Disclaimer: Curated by HT Syndication.
