Performance of resistance spot weld caps coated with Ni and Fe aluminide alloys by electro spark deposition on hot dip galvanized steel

İbrahim F.  Açış; Şükrü Talaş

doi:10.3989/revmetalm.237

Autores/as

İbrahim F. Açış Beyçelik-Gestamp https://orcid.org/0000-0002-7748-6518
Şükrü Talaş Department of Metallurgical and Materials Engineering, Faculty of Technology, Afyon Kocatepe University https://orcid.org/0000-0002-4721-0844

DOI:

https://doi.org/10.3989/revmetalm.237

Palabras clave:

Acero galvanizado en caliente, Aluminuros de hierro, Aluminuros de níquel, Deposición por electro-chispa, Soldadura por resistencia eléctrica por puntos

Resumen

La soldadura por resistencia por puntos se utiliza ampliamente como técnica principal de unión en la industria y las capuchas de los electrodos se sustituyen con frecuencia debido a su degradación durante el servicio. En este estudio, las capuchas de electrodo RSW de cobre de tipo G se recubrieron con aleaciones de Fe y Ni basadas en Fe₃Al, FeAl, Ni₃Al, NiAl mediante deposición por electro-chispa, proporcionando resistencia a la deformación en caliente, a la oxidación y a la evaporación del Zn de la chapa metálica. Las capuchas de electrodo recubiertas por estas fases intermetálicas se ensayaron in situ sobre un acero galvanizado en caliente con el fin de evaluar su rendimiento. Para ello, se seleccionaron tres voltajes diferentes para cada electrodo recubierto, y se produjeron 12 recubrimientos diferentes en total. Se fabricaron consecutivamente 50 soldaduras por resistencia por puntos con los mismos parámetros para cada tipo de electrodo y revestimiento intemetálico. Se realizaron mediciones de dureza, exámenes microestructurales, pruebas ultrasónicas y pruebas de cincelado en las muestras producidas. Además, se caracterizó la evolución de la microestructura de los diferentes recubrimientos, las variaciones de dureza y la capacidad de deformación de las soldaduras por resistencia por puntos. Los resultados mostraron que los ensayos de cincelado y los valores de espesor de la sección transversal de la muestra soldada realizada con las capuchas de Ni3Al produjeron mejores resultados que las otras capuchas. El espesor de la sección transversal de los electrodos fue menor en todos los casquillos recubiertos utilizando 158 V. El rendimiento de los recubrimientos de aluminuro puede enumerarse, del mejor al peor, en el siguiente orden: Ni₃Al, NiAl, Fe₃Al y FeAl.

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