Back to results
US 4,227,639 AGranted
Method of making a gas-tight joint between a corrugated high quality steel tube and a high quality steel sleeve
AssigneeKabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft
InventorGunther Blumenberg
Life of this patent
Estimating the term…
Abstract
The corrugation is removed from an end portion of a helically corrugated tube, and an internally threaded sleeve is threaded onto the tube. The sleeve has an unthreaded extension which is being drawn by a suitable tool to engage the smooth wall portion of the tube and is subsequently welded thereto.
Claims4
Method of making a gas-tight joint between a helically, internally, and externally corrugated, relatively thin-walled tube and a sleeve having a thicker wall;
- the tube and the sleeve being made of a high-quality steel, comprising the steps of:
- providing a sleeve having internal threading, corresponding to a helical corrugation of the tube, the sleeve further having an unthreaded, tubular welding extension;
- de-corrugating a portion of the tube adjacent to one end to obtain a smooth wall tube portion, the corrugation continues beyond the smooth wall portion;
- causing the welding extension to be in intimate contact with the smooth wall tube portion and for an axial length, being displaced from the axial end of the smooth wall tube portion;
- and
- fusion welding the welding sleeve to the smooth wall tube portion by melting a portion of the welding sleeve for fusing with the tube.
3 more elements
Dependencies are inferred from the claim text.