What makes a good welding table?

[DFBrews]

Flatness and weight are key heeavier the better so you can clamp pieces straight my table is 1/2” plate with 2” square tubing around the perimeter and I am working on fixturing holes

[Grant H.]

Flatness and weight are key heeavier the better so you can clamp pieces straight my table is 1/2” plate with 2” square tubing around the perimeter and I am working on fixturing holes

This.

Mine is also 1/2" plate, sheered from a 4x8 (not enough room in my garage for a full 4x8). I used 1x3" tube on edge around the edge, set back 3" from the edge on all sides to make clamping to the edges easier. 2x2" tube for the legs, and lockable high weight casters. I then fenced the legs on three sides with the same 1x3" tube. Still can have stuff slid underneath it, but has added support for the legs (1/2" plate is heavy... ~20lbs/sqft).

Before the legs got their cross bars.
20180603_181842 by ARNEWB, on Flickr

Showing the leg cross bars:
20181022_083625 by ARNEWB, on Flickr

As for fixturing holes, I'm still on the fence for the need. I haven't gone down that road yet, but I do know they can have their uses.

With these squares, I haven't actually found a project that I needed fixturing holes for with these, clamping along the edges of my table, and using switchable magnets.