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| Abstract No.: |
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Scheduled at:
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Wednesday, March 22, 2017, Hall Ford 10:15 AM
Innovations II
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| Title: |
Residual stress reduction by low-transformation-temperature (LTT) filler materials in electron beam welding
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| Authors: |
Stefan Gach* / RWTH Aachen, Welding and Joining Institute, Germany
Uwe Reisgen / Welding and Joining Institute, RWTH Aachen, Germany
Simon Olschok/ Welding and Joining Institute, RWTH Aachen, Germany
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| Abstract: |
In welding technology, the change of state from solid to liquid back to solid is used for joining using a localized effect of heat. Due to the thermal expansion, as well as due to structural transformations the outcome of this are residual stresses. The understanding of the process and the identification of the potential of time- and space-resolved phase transformations on the residual stresses is important to achieve high precision in the macro range. Therefore, the use of locally induced Low-Transformation-Temperature filler materials promises positive effects concerning local stresses and distortion. Influenced through specific time- and space-resolved heat treatment this metallurgical injections convert their structure in order to influence the residual stresses. Due to the time delay between the conversion of basic and additional material (injection) local stress fields can be generated and thus the residual stresses are affected. Material behavior of this LTT-filler material used in EB-Welding is examined by metallographic analysis as well as temperature measurement. The effect to the state of residual stresses are analyzed by hole-drilling and results are presented in this publication.
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