Groove butt weld design & simulation

Hi !!

I have designed a frame using UPN channel, and used the function trim/extend for weldment like the image bellow. Now I want to joint 2 UPN channel with a double sided complete joint penetration square groove butt weld.

Please can someone help ?

Do I must use weld design for simulation in the weldment  window or in the simulation window

*The gap between the UPN channel is 1/8

?

Regards. 

SolidworksSimulation