Mechanical and microstructural analysis in the welding of ductile cast iron by TIG procedure, with different filler materials and air cooling

espanolEn el presente trabajo se analizan las variaciones resistentes y microestructurales de la fundicion ductil soldada mediante la tecnica tungsten inert gas (TIG), sin tratamientos termicos y utilizando diferentes materiales de aporte (fundicion maleable perlitica, aleacion Fe-Ni y aleacion de bronce y manganeso). A partir de cada cupon soldado de dimensiones 100x100x6 mm, se obtienen las probetas para los ensayos mecanicos y microestructurales. Con el analisis cualitativo de las micrografias y el analisis cuantitativo de los resultados de los ensayos mecanicos, que han sido realizados en zonas bien diferenciadas de las uniones soldadas (metal base, interfase y cordon de soldadura), se concluye la idoneidad de este tipo de soldaduras y de la introduccion nuevas variables como los tratamientos termicos previos y/o posteriores a la soldadura. Se han correlacionando las caracteristicas mecanicas y resistentes con las microestructuras obtenidas en las placas (probetas) para poder evaluar sus ventajas e inconvenientes, asi como elaborar conclusiones. EnglishThe present work analyses the strength and microstuctural variations of ductile cast iron welded by means of the TIG technique, without heat treatment and using different filler materials (pearlitic malleable cast iron, Fe-Ni alloy and bronze and manganese alloy). The specimens for the mechanical and microstructural tests are obtained from each welded coupon with dimensions 100x 100x6 mm. Based on the qualitative analysis of the micrographs and the quantitative analysis of the results of the mechanical tests, which have been carried out in well-differentiated areas of the welded joints (base metal, interface and weld bead), it is concluded that this type of welding and the introduction of new variables such as the heat treatments before and/or after welding are suitable. The mechanical and strength characteristics have been correlated with the microstructures obtained in the plates (specimens) in order to evaluate their advantages and disadvantages, as well as to draw conclusions.