Overall and local mechanical behaviour of dissimilar laser welded joints

Iordachescu, Mihaela and Valiente Cancho, Andrés and Luzin, V. and Ruiz Hervías, Jesús and Ocaña Moreno, Jose Luis (2012). Overall and local mechanical behaviour of dissimilar laser welded joints. In: "XXIX Encuentro del Grupo Español de Fractura", 21/03/2012 - 23/03/2012, Bilbao (España).


Title: Overall and local mechanical behaviour of dissimilar laser welded joints
  • Iordachescu, Mihaela
  • Valiente Cancho, Andrés
  • Luzin, V.
  • Ruiz Hervías, Jesús
  • Ocaña Moreno, Jose Luis
Item Type: Presentation at Congress or Conference (Article)
Event Title: XXIX Encuentro del Grupo Español de Fractura
Event Dates: 21/03/2012 - 23/03/2012
Event Location: Bilbao (España)
Title of Book: Anales de mecánica de la fractura : texto de las comunicaciones presentadas en el XXIX Encuentro del Grupo Español de Fractura : 21, 22 y 23 de marzo de 2012, Bilbao
Date: 2012
Volume: 29
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Official URL: http://gef2012.mondragon.edu/es/programa


The present investigation addresses the overall and local mechanical performance of dissimilar joints of low carbon steel (CS) and stainless steel (SS) thin sheets achieved by laser welding in case of heat source displacement from the weld gap centreline towards CS. Microstructure characterization and residua! strain scanning, carried out by neutron diffraction, were used to assess the joints features. It was found that the heat source position influences the base metals dilution and the residua! stress field associated to the welding process; the transverse residual stress is smaller than for the longitudinal component, of magnitudes close to the parent CS yield strength. Furthermore, compressive transverse residual stresses were encountered at the SS-weld interface. The tensile behavior of the joint different zones assessed by using a video-image based system (VIC-2D) reveals that the residual stress field, together with the positive difference in yield between the weld metal and the base materials protects the joint from being piastically deformed. The tensile loadings of flat transverse specimens generate the strain localization and failure in CS, far away from the weld.En este trabajo se exponen los resultados de una investigacion sobre el comportamiento mecanico de soldaduras disimiles acero inoxidable-acero al carbono, realizadas para unir chapas delgadas, desplazando la fuente de calor del eje longitudinal de la union soldada por laser sobre el acero al carbono. Se han determinado las caracteristicas microestructurales de la union soldada, las tensiones residuales generadas (mediante difraccion de neutrones) y las curvas tension-deformacion locales y globales, mediante medidas locales de deformacion empleando el sistema VIC-2D "video image correlation". El desplazamiento de la fuente de calor infiuye en la dilution de los metales base y el campo de tensiones residuales asociado al proceso de soldeo; las tensiones residuales medidas en direction longitudinal se aproximan al limite elastico del acero al carbono, mientras que las tensiones residuales transversales son menores, e incluso de compresion. El ensayo a traccion de la union soldada revela que las tensiones residuales y la diferencia de limite elastico entre los metales base y la soldadura propician que la rotura se produzca por inestabilidad plastica del acero al carbono, lejos de la soldadura, sin que la union plastifique.

More information

Item ID: 16315
DC Identifier: http://oa.upm.es/16315/
OAI Identifier: oai:oa.upm.es:16315
Deposited by: Memoria Investigacion
Deposited on: 04 Feb 2014 12:46
Last Modified: 22 Sep 2014 11:12
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