Welding Weldments

I find it very easy to add fillet welds to my weldments, but I never make welds where parts butt together because i dont see any option anywhere to make a butt weld.

I have an assembly with girders and plate steel and I want to add welds wherever my weldments butt together end to end. Is this possible?

How do you make a butt weld within a part, not an assembly?

Thanks,

Doug

SolidworksWeldments