I am making a bike frame for one of my projects class and my team and I wanted to run a simple FEA on it. The only issue is I cannot create welds between the materials and the welments environment doesn't help much because they are custom profiles. Any advice on how I should proceed?
Hopefully you have modeled this as an assembly - that will make for fixing geometry for the FEA easier (IMHO). I would proceed with a globally-bonded model and chase down high stress points with solid-modeled welds with an appropriate cross section. Of course you will have to eliminate any interferences, small slivers and gaps prior to running this. The first places I see you might have problems are with the cope fitting at the top (handle/connection?) and from the round tube joint to the square tube.