Hoesch Werke Aktiengesellschaft

Hoesch Aktiengesellschaft

Hoechst Aktiengesellschaft

Heinz Gross

Friedhelm Retzlaff

Rolf Krebs

Manfred Gerber

Martin Henning

Karl Dahmen

Karl H Schlusnus

Friedrich Reith

Friedrich-Otto Koch

Adolf Peeck

Hans-Jurgen Wahl

Werner Wennemann

Friedhelm Gunter

Otto Welsing

Jurgen Duisberg

Hans Spliethoff

Wolfgang Venema

Jurgen Engel

Matthias Lang

Robert Scholl

A gas-tight joint for pipe linings and risers inside a bore, consisting of a neck with an outside thread and of a matching collar with an inside thread, with a groove in the vicinity of the thread on the collar and/or of the thread on the neck to accommodate a deformable gasket that, when the joint is screwed tight, is demarcated and deformed by the base of the groove in the neck and/or in the collar and by the contour of the thread on the other component. The cross-sectional area demarcated by the base of the groove in the neck and/or collar and by the contour of the thread on the other component once the two components have been screwed together remains constant along the groove and is equal to or larger than the cross-sectional area of the deformable gasket before the components are screwed together.

Gas-tight joint for pipe linings and risers

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.

Method and apparatus for continuous production of tubular bodies by

Improved steel profiles having superior material characteristics are obtained by rolling a precipitation-hardenable fine grain steel, cooling it from a final rolling temperature above the A.sub.1 -temperature down to a temperature of about 400.degree. C. in an atmosphere in which it is allowed to overage, whereupon the steel plate or strip is then cooled down to room temperature and cold-processed to form an open profile which can thereupon be converted into a tube by welding together its longitudinally extending edges and which is then subjected to solution-annealing in order-to dissolve coarse precipitants and subsequently further cooled to form finely dispersed precipitants in the profile.

Method of making high strength steel tube

A laser welding process is used according to the invention for the manufacture of a straight seam weld for tubular construction parts of ferritic, Ti-stabilized CR steel x5CrTi12 for exhaust systems in automobiles. This has the advantage that after welding the construction parts can be expanded or compressed by more than 40% of their original dimensions.

Use of the laser welding process for and method of manufacturing of

A method is provided for joining the ends of steel pipes having male and female ends. The pipe is inserted with the male end into the pipe with the female end and a circular seam is welded, which is disposed at the inside of the female pipe for solidly connecting the pipe with the male end to the pipe with the female end. The male end is preferably provided with a ball section and the female end correspondingly with a ball shaped socket for allowing the pipe to be angled at the connection points. The invention provides the advantage that in automatic welding no large head holes have to be dug out.

Welded pipe connection

Improved steel profiles having superior material characteristics are obtained by rolling a precipitation-hardenable fine-grain steel, cooling it from a final rolling temperature above the A.sub.1 -temperature down to a temperature of about 400.degree. C. in an atmosphere in which it is allowed to overage, whereupon the steel plate or strip is then cooled down to room temperature and cold-processed to form an open profile [which can thereupon be converted into a tube by welding together its longitudinally extending edges and] which is then subjected to solution-annealing in order to dissolve coarse precipitants and subsequently further cooled to form finely dispersed precipitants in the profile.

A method of and device for producing multi-layer pipes by helically winding a plurality of bands loosely arranged one above the other, which are individually withdrawn from a supply, straightened out, trimmed, and in the form of a band loop are conveyed to the forming station at the respective angle of lead-in corresponding to the respective pipe diameter, whereupon the layers are together welded to form a pipe strand which is subsequently cut into individual pipes. All bands are supplied and advanced independently of the irregularities of the respective longitudinal band edge shape in steadily straight lead-in directions, and all band edges are machined together to a possible maximum width in coordination with each other whereupon the bands are driven together while the welding gap is controlled in conformity with their band edge shape merely by pivoting the pipe.

Method of and device for producing multi-layer pipes

Apparatus for making seam welded tubing of the type comprising a first butt welding machine for joining together by submerged arc welding the adjacent ends of successive lengths of strip to form a continuous strip, a strip storing device for storing the continuous strip and a tube forming and welding machine is provided with a series of roll stands with the roll axes of successive stands offset from each other so that as the strip passes through the stands, it is turned over laterally. A second butt welding machine is then provided after the roll stands and before the strip is fed into the tube forming and welding machine so that the successive lengths of strip are first butt welded together along the joint on one face of the strip and then second welds are made on the other face of the strip so that no further welding is necessary after the tube has been formed and seam welded in the tube forming and welding machine.

Growing community of inventors

Dortmund, Germany

Heinz Gross