The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2004
Filed:
Jun. 14, 2001
Applicant:
Inventors:
Klaus Porcher, Lehrte, DE;
Friedrich Harten, Stadthagen, DE;
Assignee:
Nexans, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K 3/102 ; B23K 3/100 ; B23K 3/700 ; B21D 3/900 ;
U.S. Cl.
CPC ...
B23K 3/102 ; B23K 3/100 ; B23K 3/700 ; B21D 3/900 ;
Abstract
In a process for producing longitudinally welded tubes, a metal strip, which is continuously pulled from a supply, is gradually formed into a slit tube and the longitudinal slit of said slit tube is welded. The metal strip ( ) is pulled through a plurality of drawing dies ( ) arranged one behind the other and having a diameter that decreases in production direction, and in each of the drawing dies ( ) is increasingly bent in circumferential direction. The slit tube is closed in a last forming step ( ) immediately in front of the welding point.