US 11,920,701 B2
Method for producing a number of pipes having a predefined pipe diameter, pipe, and piping system
Andreas Rönpagel, Isernhagen (DE); Jan Ehlers, Timmendorfer (DE); Jendrik Schütt, Bad Oldesloe (DE); Hanjo Diederley, Timmendorfer Strand (DE); and Kai Zeugner, Groß Pankow (DE)
Assigned to Minimax Viking Research & Development GmbH, Bad Oldesloe (DE)
Appl. No. 17/252,251
Filed by Minimax Viking Research & Development GmbH, Bad Oldesloe (DE)
PCT Filed Jun. 27, 2019, PCT No. PCT/EP2019/067140
§ 371(c)(1), (2) Date Dec. 14, 2020,
PCT Pub. No. WO2020/002498, PCT Pub. Date Jan. 2, 2020.
Claims priority of application No. 10 2018 115 533.6 (DE), filed on Jun. 27, 2018.
Prior Publication US 2021/0262594 A1, Aug. 26, 2021
Int. Cl. B23K 31/00 (2006.01); A62C 35/68 (2006.01); B23K 31/02 (2006.01); F16L 13/02 (2006.01); F16L 58/10 (2006.01); B23K 101/10 (2006.01)
CPC F16L 13/0263 (2013.01) [A62C 35/68 (2013.01); B23K 31/027 (2013.01); F16L 58/1009 (2013.01); B23K 2101/10 (2018.08)] 13 Claims
OG exemplary drawing
 
1. A method for producing a number of polymer-enhanced pipes with a predetermined pipe diameter, comprising:
feeding multiple pipe parts with a predetermined pipe diameter to a welding station,
aligning in each case a first pipe part and a second pipe part coaxially with respect to one another and axially adjacent to one another,
welding the pipe parts by a fully encircling weld seam to form a pipe run,
conveying the pipe run to a cutting station in a machine direction downstream of the welding station,
cutting off a number of pipes in a respectively designated length from the pipe run; and
applying a polymer-based layer on an inside of the pipes, wherein the polymer-based layer completely covers the inside of the pipes and a root of the weld seam;
wherein the applying comprises:
coating by chemical autodeposition and dipping of the pipes into a dip bath which contains a polymer-based chemical autodeposition material;
wherein the pipe parts are formed from a metal suitable for chemical autodeposition including a ferrous and/or zinc-containing metal, and
wherein the autodeposition material comprises polymer constituents which are ionically bonded to a wall of the pipe parts and to the root of the weld seam, and is present as an aqueous emulsion or dispersion.