Accommodation of residual stresses during multipass welding by introducing variability in the chemical composition of the filler metal
Assembly of thick sheets requires a chamfering followed by multipass welding. This operation leads to thermal, mechanical and metallurgical phenomena responsible for the formation of complex residual stress field establishment. Generally, during welding operations, a unique filler metal is used and its chemical composition is close or identical to at least one of the base metals. Present proposal intends to investigate the use of either multimaterial or composition gradient stainless steel filler metals (austenitic 304L and ferritic 430) deposited on 304L stainless steel sheets, achieved by Tungsten Inert Gas (TIG) process. Collected neutron diffraction strain mapping will enable to assess the influence of chemical composition changes in weld beads onto the generated residual stress distribution, both within the beads and in the surrounding area. The comprehensive data set dug out will enable to quantify how the different physical phenomena occurring during the welding process contribute to the macroscopic residual stress field and provide the mandatory input to a concurrently developed thermomechanical Finite Elements model in order to ultimately being able to reduce them.
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THEODORE Juliette; CABEZA Sandra; Bruno Courant; COUTURIER Laurent; GIRAULT Baptiste; PAILLARD Pascal and PRIGENT Serge. (2021). Accommodation of residual stresses during multipass welding by introducing variability in the chemical composition of the filler metal. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-337
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