German experts share latest technology in Manufacturing of Metals

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Jamshedpur: The Indo-German Bilateral Workshop on “Additive Manufacturing of Metals: Current issues and way forward”, organised by CSIR-National Metallurgical Laboratory in association with Leibniz-Institut für Werkstofforientierte Technologien, Bremen, Germany kicked off today at CSIR-NML Auditorium.

Dr. Rouhan Paul, Director, IGSTC, Gurgaon introduces the modality of Indo-German bilateral program, which was incepted during 2006 in India for promoting industrial research in collaboration with Germany. He also highlighted the various opportunities and schemes available for Indian scientists and researchers to execute bilateral program in collaboration with German industry or research institutes.

Dr. Jorg Fischer, Blue Power Casting System, Germany discusses the art of developing systems for producing metallic powders for additive manufacturing with desired combination of properties. The issues involved in design of the metal atomizer nozzle is discussed and the counter measures to be taken are highlighted. The importance of inert gas atomizer in comparison to water atomizer was discussed. The precise control pf powder size and shape for the better performance during additive manufacturing can be done using the inert gas atomizer.

Dr. G Padmanabham, Director, ARCI Hyderabad gave an overview of the research activities related to additive manufacturing carried out in ARCI Hyderabad. He highlighted the importance of laser processing and its application in additive manufacturing along with the economic benefits.

ARCI developed indigenous process to produce metallic powders for additive manufacturing. The properties of the 3D printed materials produced using the market available powders are compared with the 3D printed material produced using indigenous powders. Challenges in additive manufacturing technologies and scope to cut down the product cost are discussed.

Dr. I Chattoraj, Director, CSIR-NML Jamshedpur comprehensively discussed the metallurgical defects originating from the additive manufacturing process. He highlighted the issues related to control of microstructure by controlling the heat transfer and melt pool dynamics during the process. The major defects encountered in 3D printed objects are porosity, lack of fusion, humping, balling, residual stress etc.

The control measures to get rid of the gas pores in the 3D printed material is by hot isostatic pressing of the component. Director NML highlighted (i) chemical synthesis and (ii) ball milling as the alternate process routes for production of metallic powders for additive manufacturing. The metallic powder surfaces can be tailored and hence the efficiency of additive manufacturing while adopting the alternate methods for powder production is highlighted.

Dr. S. Tarafder, Chairman, Dr. K. L. Sahoo, Co-chairman, AMM-2019 and Dr. G.K. Mandal, Co-Convener and many more industrialists, technologists were present during the 2nd day technical lecture. Around 105 delegates are from different parts of Germany as well as India participated and deliberated fourteen papers in three technical sessions (III, IV and V) today.

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