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Ingeniare. Revista chilena de ingeniería

versión On-line ISSN 0718-3305

Resumen

ARAQUE DE LOS RIOS, Oscar Javier  y  ARZOLA DE LA PENA, Nelson. Theoretical and experimental study of the phenomenon of post weld cooling in a cruciform welded joint. Ingeniare. Rev. chil. ing. [online]. 2016, vol.24, n.2, pp.228-238. ISSN 0718-3305.  http://dx.doi.org/10.4067/S0718-33052016000200006.

This paper presents a study on the behavior of the temperature field and the profile of residual stresses that appear in a type cruciform welded joint during post weld cooling phase. A 3D model and an analysis of nonlinear transient heat transfer by the finite elements are used. Corroboration of the simulations were done experimentally, achieved by constructing welded cruciform specimen geometry using the SMAW process, using as a base contribution metal plates HR ASTM A36 structural steel and metal electrodes corresponding to E6013 contribution. Specimens were subjected to three cooling conditions: water, oil, and air. A field defined initial temperature according to thermo-graphics data that were obtained experimentally during the construction of not standardized specimens, which were made from three different hick welding sizes, while plate thickness where kept constant. Very good correspondence between both cooling curves obtained experimentally and by numerical simulations was found. This work shows that the size of the region affected by residual stresses and peak magnitudes are influenced by the cooling medium. High cooling medium produce high cooling rates, generating residual stresses regions of bigger magnitudes. Furthermore, an increase in the residual stress along the welding hick was observed.

Palabras clave : Cruciform welded joint; cooling rate; residual stress; temperature profile.

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