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5986 |
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Thursday, May 23, 2019, Saal Brüssel 12:40 PM Brazing of Ni-/Fe-based materials |
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Manufacturing of Ni-based brazing form parts by means of additive manufacturing |
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Martin Schmitt* / voestalpine Böhler Welding Fontargen GmbH, Germany Olaf Hendriks / Voestalpine Böhler Welding Fontargen GmbH, Germany |
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Additive manufacturing allows the individual and flexible production of components with completely new shapes and functionalities within only one process step. Here, one or more liquid or solid materials are assembled in layers according to specified dimensions and shapes. For the manufacturing of metal components, metal powders if necessary with binders are often used, which will, depending on the used process, form the required structure via physical or chemical hardening or melting process. Nickel brazing materials are usually available as powders, pastes or amorphous foils. Due to the brittleness of the material complex brazing form parts are not easily produced. Additive manufacturing offers a new range of possibilities for the realization of three-dimensional structures from powders, so that the production of brazing form parts is supposable via additive processes. This study discusses possible processes for the production of brazing form parts by means of additive manufacturing. Focus of this lecture is on the powder bed process patented by us, which produces brazing form parts using selective laser melting. The study examines two brazing alloys. It is shown that selective laser melting cannot easily be used for all brazing metals. Due to the extreme brittleness of some Nickel brazing alloys a compensation of the extreme temperature differences, occurring during production of the components, is not possible. With an unsuitable process control cracks in the brazed part may occur. The part is therefore unusable. Brazing form parts can be produced with the right process control and suitable brazing material. First brazing tests show a good melting behaviour in the brazing process. |