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Professor at Instituto Tecnologico de Aeronáutica
He graduated in physics from the Catholic University of São Paulo (1989), Master in Nuclear Technology from the University of São Paulo (1992) and hold a Ph.D. in Metallurgical and Materials Engineering from the University of São Paulo and Swiss Federal Institute of Technology (1997). He was research and teaching Assistant of Professor Wilfried Kurz from 1997 to 2000. Has worked on projects with big companies like Von Moss / Swiss Steels, ThyssenKrupp, Usiminas, Volvo, Alcan, Alstom, as well as participated in the process of incubation and micro-enterprises promotion of the Technology Park of Sao Paulo. Participated as a consultant, the deployment of two French companies in Brazil, through the consortium Isotech / Pays de la Loire. He was a Member of Council of the Millennium Factory Institute. He was a consultant ad-hoc project of the Center for Competitiveness and Innovation Brazil. He was visiting professor at the Federal University of Uberlandia (UFU), Universidad Nacional de Colombia (UNAL) and Colorado School of Mines (CSM). He is currently responsible for the laser processing labs at the Institute for Advanced Studies (IEAv), is associate professor at the Instituto Tecnologico de Aeronautica (ITA), is associate professor of the School of Mines, Federal University of Ouro Preto (UFOP). His laser materials processing graduate course at ITA completed ten years in 2016. Currently, he is also consultant in some metal working industries. He has experience in Materials Engineering and Metallurgy, with an emphasis in Physical Metallurgy, acting on the following topics: welding, laser welding, surface treatments, nanotechnology, additive manufacturing and technological innovation.
Instituto Tecnologico de Aeronáutica
January 2002 - Present
Sao Jose dos Campos
Professor of the Graduate program on Space Sciences and Tecnologies.
Swiss Federal Institute of Technology
January 1992 - December 1997
Metallurgy
Laser processing of cast iron
Process for avoiding cracking in welding
De Lima Milton Fernandes, Wilfried Kurz, Michel Rappaz, Jean-Daniel Wagniere
The new welding process avoids cracking in welding, in repair welding or in cladding of parts of metallic alloys which are sensitive to hot cracking. The
process is using a first heat source (15), directed to the parts (11, 12) of the metallic alloy forming a melt pool (14) on 5 the parts (11, 12) of metal or metallic
alloy. The heat source (15) and the parts (11, 12) are moved relative to each other. The process is characterized in that there is one (13) or more additional
heat sources directed to the parts (11, 12) of metal or metallic alloy and following the first heat source (15) in a distance and with substantially the same speed and in the same direction as the first heat source (15). The additional heat source (13) or heat 10 sources are directed to the solidification region (mushy zone) (144) of the melt pool (14) generated by the first heat source (15). The power of the additional heat source (13) is set such as to reduce the local cooling rate of the solidification region (144) of the melt pool (14), or to even shortly reheat this region without substantial remelting or with no remelting it at all and thereby reducing the tensile stresses or even inducing compressive 15 stresses. During this process a central equiaxed zone might also be enhanced. By this new process the formation of hot cracks is avoided.