So today was the day to try and weld the broken handle bar stem. I chose to use a MIG because that is what I have. I beveled the edges with a file and lined everything up. I used the cone nut to hold the bottom where I wanted it and placed a couple of tack welds. On the one broken piece I did weld the inside as well. Once the second piece was in place I followed the same process. I did use a propane torch tonpre heat all of the pieces to help with making the weld less brittle along the HAZ. I cleaned the welds up with a sanding disk and test fit everything back together. I did tighten things down about 80% and it held. I will be excited to get the rest of the fame finished and reassemble to see if my welding will hold up. Thanks for the suggestions and the likes on this thread. I also wanted to note that the end goal with this bike will mostly be for display and maybe an occasional parade ride. If the weld fails during final assemble, I will likely use the suggestion of cutting it off above and making a new lower section.