Effect of interpass temperature on residual stresses in multipass welds produced using low transformation temperature filler alloy TRIP

T. I. Ramjaun, H. J. Stone, L. Karlsson, J. Kelleher, R. J. Moat, J. Robelo Kornmeier, K. Dalaei and H. K. D. H. Bhadeshia


Weld filler alloys that exploit transformation plasticity through low austenite-to-martensite transformation temperatures offer an effective method of reducing residual stresses in strong, steel welds. However, in multi-pass welds the heat input from later weld passes may be insufficient to retransform prior welding passes, leading to the accumulation of thermally-induced strains and elevated residual stresses. In this work, the residual stress distributions produced around arc welds fabricated with a martensitic weld filler alloy that transforms at a low temperature, have been studied as a function of the number of passes deposited and the inter-pass temperature. It is found that when the inter-pass temperature is above the transformation temperature of the weld metal, the entire multi-pass weld transforms as a single entity, thus permitting the optimum exploitation of the transformation plasticity. In contrast, the deposition of new metal with a relatively low inter-pass temperature leads to increased residual stresses in the underlying layers, reducing or eliminating the beneficial stress states previously created.

Science and Technology of Welding and Joining 19 (2014) 44-51.

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