Weld two 30-inch angle-iron bars perpendicularly to the ends of a 46-inch angle iron using a mig torch and mig wire.
Mig weld a second 40-inch angle-iron bar to the free ends of the two 30-inch angle-iron bars creating a metal square.
Sand the welds using a power metal sander to remove sharp points, rounded welds and create flatness along the edges.
Drill two 1/4-inch holes in each side of the metal square 3 inches from the corners using a 1/4-inch Tungsten carbide drill bit and a variable speed drill.
Tack weld two 30-inch long, 1-by-1-inch square metal bars perpendicularly to the ends of a 46-inch long, 1-by-1-inch square metal bar.
Tack weld another 46-inch long, 1-by-1-inch square metal bar to the free ends of the 30-inch square metal bars.
Mig weld the square metal bars to each other and sand the welds once they have cooled making the middle of the welder's bench frame.
Tack weld a 20-inch long, 1-by-1-inch square metal bar, a leg, to each corner of the frame.
Tack weld the angle-iron square to the open ends of the legs.
Flip the box over so the square metal frame is on top.
Cut the corner squares of a 30-by-46-inch, 12-gauge mesh wire and tack weld the wire to the frame.
Tack weld a new 20-inch long,1-inch square metal bar to each corner of the frame square.
Insert a caster wheel into the open hole at the end of the second set of 20-inch legs.
Mig weld all corners, legs and wire and sand the welds with a power metal sander once cooled.
Set a 32-by-48-inch metal sheet on your work floor and top it with a 32-by-48-inch sheet of plywood.
Set the welder's bench frame on the plywood, centered with a 1-inch edge all around.
Drill 1-inch screws into the eight holes earlier drilled 3 inches from each corner.