Still gotta make the stud stick.You don't really get a 'weld'. Different types of plastic don't always melt together. It's more of a mechanical connection (like making a knife handle). I've considered making a pair of pliers I could heat and use like a rivet setup, to melt over the heads of the dowel...but haven't gotten around to it.
Diff plastics is a huge issue, with heat or solvent(glue).
I've screwed up many a plastic thing with the wrong glue....
.....would not risk it on an expensive brooder base.
Mighty tempting tho!