Abrégé

The invention relates to a method for the production of hollow bodies made of high-temperature resistant steel by welding prefabricated, bent sheets or shell-like molded parts, which complement each other to form the hollow body to be produced. It is the object of the invention to further develop the method of said type, so that a better creep strength results even with frequent temperature changes and steep temperature gradients. In order to achieve this object, the invention proposes - that the wall thicknesses of the molded parts in the region of the borders of the molded parts to be welded with one another are designed taking into account the welding seam factor WSF = 1, - that the welded joints are made using butt welds, which are made with the electron beam welding method without filler materials, - and that, after producing the welded joints, the entire welded hollow body is subjected to a thorough heat treatment by means of heating above the conversion temperature, quenching and annealing.

Classes IPC  ?

• B23K 26/26 - Soudage de joints continus rectilignes
• B23K 15/00 - Soudage ou découpage par faisceau d'électrons
• B21C 37/08 - Fabrication de tubes à joints soudés ou brasés
• B21C 37/29 - Fabrication d'organes de branchement, p. ex. pièces en forme de T

Abrégé

The invention relates to a method for producing a housing central part (1) of a high-pressure slide gate valve composed of high-temperature-resistant steel, in which method two die-forged housing central part half-shells (1a, 1b) with integrally forged connectors (4a, 4b) are welded to one another, by an electron beam welding process without welding filler, by way of a butt-jointed weld seam (2) running in a plane (3) which runs transversely with respect to the pipe connectors (4a, 4b) and which divides the housing central part (1). In order, in the case of a housing central part of said type, to increase durability with low production costs and to reduce weight, the invention proposes that the wall thicknesses of the housing central part half-shells (1a, 1b) be designed, overall, on the basis of a weld seam factor (WSF = 1), and that, after the production of the weld seam (2), the entire housing central part (1) be subjected to rigourous heat treatment with heating to above the conversion temperature, quenching and annealing.

Classes IPC  ?

• F16K 27/10 - Logements soudés
• B23K 15/00 - Soudage ou découpage par faisceau d'électrons