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Mikrostruktur- und Härteentwicklung in Schweißnähten mit neuartigen LTT-Schweißzusatzwerkstoffen
(2013)
Residual stress engineering in welding becomes more and more prominent as the use of tailored materials, e.g., high-strength steels, calls for maximum utilization of the material properties. As a consequence, residual stresses have to be considered as design criterion. Moreover, it may be utilized to improve the material's performance. Low transformation temperature alloys are a smart approach to control the residual stresses already during the welding process avoiding time-consuming postweld treatments. This paper gives an overview about the progress made in research in this topic with special focus on residual stresses. Basics as well as important developments will be addressed.
Zum Mehrlagenschweißen mit Hilfe von LTT-Zusatzwerkstoffen unter definierter Schrumpfbehinderung
(2015)
Independent from the interpass temperature residual stresses in longitudinal direction were lower than in transverse direction. This applies for the surface as well as for the bulk of the welds.
Residual stresses in the bulk were in general lower compared to stresses found on the surface.
Compressive residual stresses as a result of the martensite formation were formed in the bulk weld metal, only.
Independent from the LTT filler used high interpass temperatures were beneficial to reduce the stresses mainly in longitudinal direction.
Lower interpass temperatures tend to narrow the tensile zone in the weld metal but they also prevent the formation of compressive residual stresses.
Independent from the interpasstemperature residual stresses in longitudinal direction were lower than in transverse direction. This applies for the surface as well as for the bulk of the welds.
-Residual stresses in the bulk were in general lower compared to stresses found on the surface.
•Compressive residual stresses as a result of the martensite formation were formed in the bulk weld metal, only.
•Independent from the LTT filler used high interpasstemperatures were beneficial to reduce the stresses mainly in longitudinal direction.
•Lower interpasstemperatures tend to narrow the tensile zone in the weld metal but they also prevent the formation of compressive residual stresses.