Fabrication of the metal for the wheel trolly is done. Time to starting fretting about the welding.
I am an occasional welder, so I always have to practice before welding a project. I had a gas leak problem with my MIG, but with the help of forum members it got worked out and the MIG is working fine.
Any of you welders out there feel free to point out problems you see.
Yesterday, I tried a couple practice welds on the big angles. I made clamping fixtures to assure my corners are 90º. It is a section of 3 x 3 x 3/6 angle that I checked to be sure it was 90º. I rounded the outside corner for clearance to keep it from getting stuck in case the weld penetrated all the way in. I also spaced out one one side for some stand-off with a section of .25" bar stock. Belt and suspenders.
I beveled the facing edges of the parts and clamped them to my fixture, leaving about a tenth inch gap.
The first practice weld looked pretty good to me. I tacked the ends and ran the bead with an oval weave. It penetrated to about 3/100ths of the inside corner. I don't know if that is good enough or if I should make the gap a little wider. I had the welder set for 1/4" material. The parts are 1/4" and 3/8". Maybe I should set it for 3/8"?
I checked it for square and it was perfect. I feared that the weld would shrink and pull the joint open a little.
I cut a section of the weld and tried an acid test. The acid test was done on the second test weld I did. I got a little off line and had too much stand-off on the end I tested so it wasn't quite as hot as the first weld. It looks like I only got good penetration in the top half of the weld. The bottom half doesn't look fused.