Influencia de la temperatura de precalentamiento en la soldabilidad de un acero doble fase
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The double phase steels present mechanical properties of high strength and ductility due to their ferritic matrix with a variable martensitic phase fraction. In the present study is stablished the influence of the preheating at 250° C and 400° C on the weldability of this type of tempered steel at an intercritical temperature and welded by the bow manual electrode process (LINCOLN GRINOX E 308L-16).From the resulting matrices from AISI SAE 1045 steel where obtained strain gauges, tensile, impact and metallographic samples were obtained in order to identify values corresponding to the mechanical properties obtained in each process. Were analyzed the areas affected by the heat were analyzed and related to the profiles of microhardness of welded joints. The obtained results indicate yield limits, strain values, deformation rates and different types of microstructure for each preheating temperature.