Valmet Aktiebolag

Andreas Hjaertqvist

Magnus Hoegman

Stefan Moden

Hans Ivarsson

Johnny Anerud

Martin Raedman

Jonas Cederloef

Anna Danielsson

Stefan Thyberg

Sune Wendelsson

The invention relates to a method of making a steel Yankee cylinderby welding a cylindrical shellto two end wallssuch that the cylindrical shelland the end wallstogether form the Yankee cylinder. The welding operation is carried out exclusively from the outside of the Yankee cylinderand in the welding operation is carried out as a butt welding operation in which a backing materialis used on the inside of the Yankee cylindersuch that, between each end walland the cylindrical shell, a single weld beadis formed which extends all the way between the opposing surfacesand completely fuses the opposing surfacesof each end walland the cylindrical shellrespectively.

Method of making a steel Yankee cylinder

The invention relates to a steel-made Yankee cylinder () that comprises a cylindrical shell () having two axial ends (). An end wall () is connected to each axial end () by a circumferential weld bead (). The cylindrical shell has an inner surface () in which circumferential grooves () are formed. From the outermost circumferential groove () at each axial end () to the circumferential weld bead () at that axial end () the wall thickness (T) of the cylindrical shell is either constant or decreasing and the depth (d) of the circumferential grooves increases axially from the outermost circumferential groove ().

Steel-made yankee cylinder

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Karlstad, Sweden

Andreas Hjaertqvist