Leonardo Boccanera Avatar

Leonardo Boccanera

Dr. Ing

Senior Engineer with specific knowledge in mechanical, material science, welding process / procedure, fabrication, design and project management. Skills and knowledge Material Selection and specification. Fabrication codes. Welding processes and procedure. Thermal spray processes. Non destructive...
See More

experience

Senior Engineer - Welding & Materials Areas  
Ternium Siderar, October 2005 to Present

Ternium is one of the largest manufacturers of flat and long steel products in the world.It manufactures hot rolled, cold rolled, hot dip galvanized, electrogalvanized, prepainted and tinplate steel sheet products. Tasks: Engineering solutions for plant upgrades / refurbishment and maintenance. Materials selection under several operations conditions (abrasion, corrosion, high temperature, fatigue, high stress and deformation). Failure analysis. Welding procedure and process (solid wire, covered filler metals and flux-cored wire) - Hardfacing materials (Cr, Nb, Mo, V, W carbides). Non destructive test - Integrity analysis of components of gas conducting systems (Off / Up Take, Down Comer and Dust Systems). Mechanical testing of gastek materials. Coating (paints, glass fiber and resins) materials for components of sulphide plant. Pressure Vessel and Fuel Oil Tanks documentation and test managing according to goverment regulations.

Senior Engineer - Welding & Materials Areas  
INVAP SE, August 2000 to October 2005

INVAP is considered the key technology company in Argentina, qualified supplier of NASA for complex aerospace payloads, qualified contractor for nuclear reactors, oil and gas industry and complex projects. INVAP exports to the US, European, Middle East, Australia and Asian markets. • Tasks: Engineering design of mechanical components. Welding and material specification. Corrosion – erosion and abrasion characterization materials (Gas & Oil industry). Materials selection for nuclear components (Zirconium, Hafmium, Graphite, Stainless Steel, Aluminum alloys). Quality assurance review, support procurement and manfuacturing process. Coordination of activities with international suppliers. Testing and prototype manufacturing. Qualification and mechanical test of compounds materials to satellital area. CAREM and OPAL Reactors: Surveillance materials program. Development of welding procedure and process (Zirconium, Stainless Steel, Aluminum alloys). Zirconium forging specification. OPAL Reflector vessel: Mechanical and physical test for (Zircaloy 4 and Zr-Nb alloy, Hafmium control rod, Control guide box). Structural modelling analisys, testing, re-enginering, coordination of activities with structural, neutronic, thermalhydraulics, mechanical and process engineering teams. Selection fo materials under high neutron flux and high corrosion environments.

Senior Engineer - Welding & Materials Areas  
Nolazco Lopez, December 1993 to October 1994

Nolasco Lopez: Tank (Oil, Fuel) and Gas pipe line builder Task: Workshop leader. Materials selection. Welding procedures and welders qualification. Non destructive test. Oil tanks fabrication (80 m3 y 140 m3)

Senior Engineer - Welding & Materials Areas  
Nolazco Lopez, December 1993 to October 1994

Nolasco Lopez: Tank (Oil, Fuel) and Gas pipe line builder Task: Workshop leader. Materials selection. Welding procedures and welders qualification. Non destructive test. Oil tanks fabrication (80 m3 y 140 m3)

Senior Engineer - Welding & Materials Areas  
AGA, January 1991 to August 1992

Gas & Welding & Cutting equipment and filler metals. Task: Welding procedures and process

Senior Engineer - Welding & Materials Areas  
AGA, January 1991 to August 1992

Gas & Welding & Cutting equipment and filler metals. Task: Welding procedures and process

education

Universität der Bundeswehr - Germany  
Specialization, Thermal Spray Specialization, Jan, 1997 to Jan, 1998


Universidade Federal de Santa Catarina - Brasil  
PhD, Mechanical Engineering, Jan, 1995 to Jan, 1999


Universidad Nacional de La Plata - Argentina  
Aeronautical Engineer, Engineering, Jan, 1982 to Jan, 1989


projects

OPAL Nuclear Reactor  by  Leonardo Boccanera    
August, 2000 - Present
Open Pool Australian Lightwater (OPAL) reactor is a state-of-the-art 20 Megawatt reactor that uses low enriched uranium (LEU) fuel to achieve a range of research, scientific, industrial and production goals.

publications

Stress Concentration Effects on Industrial Components     
Published by (Journal of Failure Analysis and Prevention / Springer)
Authors: Leonardo Boccanera, Gastón Viau, Rogelio Ortega, Ezequiel Pasquali, Hector Sbuttoni.  Published December 08, 2010

This paper demonstrates the importance of stress concentrations on the life of industrial components. The design review and analysis of maintenance tasks (repair) can foresee and avoid such harmful design defects and/or bad habits that can reduce component life in service. Three steel shop examples are mentioned and details of these selected situations are analysed using metallurgy and finite element tools.

Fisuración en Tubos de Refrigeración del Horno Cuchara de Aceria de Ternium Siderar     
Published by (17th Steelmaking Conference / 7th Ironmaking Conference)
Authors: Leonardo Boccanera, Jaime Usart, Oscar Biga, Jorge Ines, Janine Booman, Jose Luis Otegui.  Published November 10, 2009

Este artículo analiza las causas de las fallas repetidas en las tuberías de refrigeración del horno cuchara de Acería y las alternativas para su mitigación. El mecanismo de daño fue identificado como propagación de fisuras circunferenciales desde la cara expuesta a los humos, asociadas a daño previo por plasticidad cíclica, o fatiga térmica de bajo numero de ciclos. El daño es producido por los ciclos de calentamiento y refrigeración a los que se someten los tubos en servicio, y por las diferencias de temperatura entre la cara caliente y la fría. Los ciclos térmicos están relacionados con el proceso de entrada y salida del horno durante el proceso y, con la formación y caída de escoria de las paredes del horno. Las diferencias de temperatura entre las caras caliente y fría generan ciclos de tensiones elevadas que pueden sobrepasar dos veces la tensión de fluencia y generar daño por fatiga térmica. No se observaron otros mecanismos de degradación que contribuyeran significativamente a la rotura, esto es, disminución del espesor, corrosión severa, envejecimiento o problemas constructivos. Las alternativas de mitigación apuntan al reemplazo del material de los tubos por uno de mayor resistencia a la fatiga y a reducir el gradiente de temperatura en el espesor y mejorar la transmisión de calor. Para ello se sugiere la colocación de atrapa-escoria, la disminución del espesor de la pared del tubo, la modificación de los circuitos (simetría), y la colocación de bombas booster para aumentar presión y caudal del agua de refrigeración.

Hammer Deburring Failure Analysis of CCD Machine     
Published by (17th Steelmaking Conference / 6th Ironmaking Conference)
Authors: Leonardo Boccanera, Rodolfo Velazquez, Ezequiel Pasquali, Hector Sbuttoni.  Published November 05, 2008

El artículo analiza la rotura de varios martillos de la máquina rebabadora utilizada en la salida de planchones de CCD. Se observo que todas las roturas se inician por fatiga sobre la cabeza de los martillos, originada por los golpes de éstos durante el arranque y la parada de la rebabadora. Esto produjo fisuras en los ojales que se propagaron producto del aumento de los esfuerzos de flexión en esas zonas. El material utilizado en la fabricación de los martillos es un acero Cr-Si de dureza 34 a 39 HRC con estructura metalográfica constituida por martensita revenida con nódulos de perlita fina y restos de ferrita en borde de grano, además de apreciarse decarburación superficial. Estas dos observaciones denotan que existió una deficiencia en el tratamiento térmico del material que como consecuencia influencia en la resistencia a la fatiga. Por último se analizó las posibles mejoras a implementar y los resultados obtenidos. Como resultado de esto, el proveedor cambia el material y aumenta la dureza del mismo mostrando una diferencia importante en la performance de los mismo.

Post-Weld Heat Treatment Stress relaxation in Zircaloy 4 plasma welds     
Published by (Trans Tech Publications, Switzerland)
Authors: Leonardo Boccanera, J.R. Santisteban, L. Fernández, H. Corso, R. L. Martínez, L. Edwards, J.A. James.  Published January 01, 2006

We have studied the effect of a post-weld heat treatment on plasma arc welds on Zircaloy 4 plates. The samples consist of two 100 mm long, 50 mm wide, and 6.25 mm thick plates, welded along the rolling (longitudinal) direction. The heat treatment consisted of a steady increase in temperature from room temperature to 450oC over a period of 4.5 hours; followed by cooling with an equivalent cooling rate. Residual strains and stresses along the longitudinal, transverse and normal directions on an as-welded and a heat-treated specimen were measured by neutron diffraction on the ENGIN-X beamline at the Isis Facility, Rutherford Laboratory, UK. Peak tensile stresses of (105±25) MPa were found in the as-welded specimen, which were reduced to (70±20) MPa after the heat-treatment. Thermal compressive stresses of (-80±20) MPa were found along the normal direction, which were not affected by the heat treatment. The use of a full-pattern Rietveld refinement for the determination of bulk strains in Zircaloy specimens is also discussed.