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Schulze-Küppers, Falk
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article
Microstructural changes in the welding of titanium-stabilized steels
Abstract
<jats:title>Abstract</jats:title><jats:p>At the Central Institute for Engineering, electronics, and Analytics (ZEA-1 by its acronym in German) of the Julich Research Center GmbH, a cryostat was developed for the European Spallation Neutron Source (ESS) and manufactured from a titanium-stabilized austenitic stainless steel alloy (EN 1.4571). After tungsten inert gas welding, the welds exhibited a black, patchy discoloration. After materialographic preparation, the phenomena were examined using microscopic methods to assess their impact on the strength of the weld and thus on the usability of the cryostat. Not only could the impact on the cryostat operation be assessed, but the formation mechanism could be elucidated and suitable measures could be outlined to avoid the black, patchy discoloration.</jats:p>