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:
May. 02, 1989
Filed:
Sep. 18, 1987
Rolf Krebs, Hamm, DE;
Otto Welsing, Hemer, DE;
Friedhelm Retzlaff, Kamen-Methler, DE;
Friedhelm Gunter, Dortmund, DE;
Hans-Jurgen Wahl, Munster, DE;
Manfred Gerber, Hamm, DE;
Heinz Gross, Dortmund-Syburg, DE;
Hoesch Aktiengesellschaft, Dortmund, DE;
Abstract
Method and apparatus for the continuous industrial production of tubular bodies in which coated or uncoated steel strip is formed to a slit tube and the opposite strip edges are longitudinally seam welded at high speed by a laser beam of high energy density under protective gas with or without supply of additive material, and after a preparation adapted to the narrow melt zone and bringing together of the strip edges a fusion welding with subsequent controlled cooling and upsetting is carried out which results in a seam geometry suitable for any further processing.