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:
Sep. 16, 1986
Filed:
Apr. 01, 1985
Applicant:
Inventors:
William J O'Donnell, Bethel Park, PA (US);
Jan S Porowski, Pittsburgh, PA (US);
Assignee:
O'Donnell & Associates, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148131 ; 148-4 ;
Abstract
A process for reducing the residual welding stresses in the weld metal, heat-affected zone and in the adjacent base metal of steel piping that have been butt welded to each other end to end by means of a circumferential weld which comprises mechanically introducing compressive stresses in said weld metal, heat-affected zone and adjacent base metal higher than their individual yield strengths but not exceeding their ultimate strengths in compression.