Abstract
An experimental setup is presented in order to obtain experimental data during solidification of a static weld pool after arc extinction with a GTAW process. Several devices have been set up to extract three kinds of measurements: (i) solidification front velocity (ii) fluid flow velocity at the vicinity of the front (iii) temperature field in the solid part. A high-speed camera is used to film the interface during welding at microscopic level and an infra-red in order to take the temperature field around the weld pool in the solid part. After processing and calibration of the videos, the experimental results are compared to theoritical results founded on an adapted model from the KGT [1] and from the one of Gandin et al. [2]. All the tests are done thin plate of Cu-30wt.%Ni.
Highlights
The microstructure of welded joints mainly determines their mechanical properties
On in-situ observations, Zhao et al [4] proves that the fluid flows have complex shapes that can influence solidification
Delapp et al [5] based on microscopic observations showed that fluid flow could produce fluctuation of the front speed giving ripples on the weld bead
Summary
The weld bead microstructure results from the solidification process occurring in the weld pool at the solid/liquid interface. This process of solidification includes mechanisms that are driven by heat and fluid flow. Compared to the common case of solidification such as casting, welding processes induce high thermal gradients and high solutal gradients at the solid/liquid interface and the front velocity is much faster. Due to these solidification conditions, columnar and equiaxed dendritic microstructures are broadly observed. Delapp et al [5] based on microscopic observations showed that fluid flow could produce fluctuation of the front speed giving ripples on the weld bead
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