why there is no black bead around when i create weld beads?

Hi everyone,

I just start learning weldments  tools. I created two parts and wanted to apply a weld bead around  the intersecting edges. But when i finish the weld bead  there is no black bead around only a weld symbol. I don't know why it happens.

Please help me out and thank you for your time!!

SolidworksWeldments