EP 1112787 A2 20010704 - Apparatus and manufacturing process for making a gas-tight flexible welded pipe
Title (en)
Apparatus and manufacturing process for making a gas-tight flexible welded pipe
Title (de)
Verfahren und Vorrichtung zur Herstellung eines geschweissten gasdichten und flexiblen Rohrs
Title (fr)
procédé et dispositif de fabrication d'un tuyeau flexible soudé étanche au gaz
Publication
Application
Priority
IT MI992753 A 19991230
Abstract (en)
A gas-tight tube is formed starting from a strip of partially corrugated sheet metal with longitudinal corrugations, assembled in a spiral with overlapping edges and welded. The manufacturing process comprises winding the sheet metal strip upon itself in a spiral so that a corrugated portion of a strip length externally overlaps a flat portion of a previously wound strip length, and welding the overlapping portions to each other. The apparatus comprises a feeding device for feeding the corrugated strip, to a rotating mandrel with which pressure rollers collaborate to bend the strip in a spiral; downstream of the mandrel it comprises a welding device that welds the overlapping portions of the spiral of metal strip. <IMAGE>
IPC 1-7
IPC 8 full level
B21C 37/12 (2006.01)
CPC (source: EP)
B21C 37/122 (2013.01)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
EP 1112787 A2 20010704; EP 1112787 A3 20020731; EP 1112787 B1 20060201; AT E316829 T1 20060215; DE 60025790 D1 20060413; DE 60025790 T2 20061102; ES 2258436 T3 20060901; IT 1314350 B1 20021209; IT MI992753 A0 19991230; IT MI992753 A1 20010630
DOCDB simple family (application)
EP 00125604 A 20001122; AT 00125604 T 20001122; DE 60025790 T 20001122; ES 00125604 T 20001122; IT MI992753 A 19991230