This welding table is absolutely key to the shop. The frame is made from 4 inch square tubing and the table top is two blanchard ground 1 inch thick steel plates that are precisely aligned.
All the pieces cut to length and ready to go. The table weighs about 700 lbs so I needed a way to move it around the shop. That's what those trailer jacks and casters are for.
The trailer jack mounts (top left) bolt to the side of the table via these weld nuts, so I started with those.
This is the trailer jack and casters welded to some square tubing. Originally these just used a large pin to connect to the trailer jack mounts, but there was to much play so I ended up just welding the joint together. Now the entire assembly just gets bolted to the table when I want to move it, otherwise they're kept out of the way in storage.
The table is constructed of two of these legs and connected by two upper cross beams.
These are what the feet screw into. They get welded to the bottom of the legs. The nut goes up into the legs for a lower profile.
Time for the icing on the cake! I used 400 lbs magnetic clamps and an engine hoist to move these plates onto the table. Each plate is 24 x 36 inches and 1 inch thick.
Once the steel plates were on top of the table, I put a 4 inch gap between them and began leveling them with respect to each other, adding shims underneath where necessary. Once they were good, I just tack welded them into place in order to not distort the plates. In hindsight, I would bolt them on because even those small tack welds distorted the plates very slightly. I'm still very happy with the end result though.
Here are the trailer jacks attached to the table; one jack per side.
Here is the pin I mentioned earlier. I have since changed this and just welded the pieces together.
Forgot to mention I welded on some rods underneath the table top for grounding the welders. Very convenient when the entire table is grounded.