Question: Question 2. On the axis below accurately sketch the solid-liquid composition profiles in terms of Ag along the weld centerline of an electron beam

Question 2. On the axis below accurately sketch the solid-liquid composition profiles in terms of Ag along the weld centerline of an electron beam weld in an Cu-3Ag (97%wt Cu - 3%wt Ag) alloy when the opposing solidification fronts shown in the figure below are 20 microns apart. Clearly show all your work and state any assumptions you make. (7) Welding speed (vw) = 20 mm/s D. (Ag in Cu at 1100 C) = 8 X 10 cm/s Ds (Ag in Cu at 900 C) = 7.5 X 10 cm/s G = 300 C/mm % Ag ++ -14 -12 -10 -8 -6 -4 -2 -------- 0 Weld Centerline 2 4 6 8 10 12 14 microns

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