You are going to get much better results with a hand calc out of Shigleys for a welded joint in pure shear. Get the allowables from AISC 360 if it's in fatigue.
"check someone's work"
what have they provided you with? fea or hand calc?
what is your concern with their work?
the reason i ask is like mike pointed out, analyzing a weld is challenging with fea. especially because i think where you're pointing at for a "weld" might be a singularity.
but some basics
sim pro > weld connector
or model the welds and use solids
the lower restraint will be challenging but a normal to restraint should be a good start
force on the top should be just a simple force
Yeah, I could have been more clear. Analyzing welds in FEA is a pretty sophisticated task. If you are not confident that you understand the pitfalls, I would not deliver that analysis. You are on much more solid ground with handbook type calcs. Also, the case you have presented is very simple. I can see a lot of disadvantages but few advantages to going to FEA for this.