Howdy kids hope all are well

I have a chunk of 1/4" plate that is 32" x 16"

to stiffen this plate I plan to weld some parallel flat bar 1" x1/8" x 16" along the 16" direction of the plate. The flat bar will be positioned and welded so that the 1" side will be perpendicular to the 1/4" plate.

These stiffeners will be equal spaced.

My concern is that I will warp the plate.

What can I do to minimize warping?