Patent · US Expired

Clamping device for tubes to be welded together

US4483477A · kind A · utility

4Cited by

8References

13Claims

0Family size

Assignee

Walter Eckold GmbH & Co. KG · DE

Inventors

Gerd-Jurgen Eckold · Braunlage, DE
Hans Maass

Key dates

Filing date	Jul 6, 1982
Grant date	Nov 20, 1984
Priority date	—
Expiry date	Jul 6, 2002

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23K37/0531
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

Tubular members which are to be joined by establishing a circumferential weld bead at abutting ends thereof are engaged by an internal clamp which defines a circumferential groove aligned with the weld zone. This circumferential groove, which is formed by cooperating surface grooves in a plurality of radially movable jaws, is filled with an inert gas during welding. The action of the jaws insures centering of the tubular members and prevents shrinkage and other misalignment during welding.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.