Aerospace has embraced metal additive manufacturing (AM) cautiously, for several reasons. One is the complexity of certifying a process in which the material is made as the part is produced. Another is size: Most aircraft and engine structural parts are too large for 3D printing. That is now changing. General Electric has shipped the first beta versions of a meter-class laser powder-bed fusion AM machine to a small group of customers for testing, and Arconic has signed an agreement with ...

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