HW Name Unknown

[Eventorizon]

Well for start it's not finished and I can't see a problem after all you weld spikes on to spinners what the difference

You mean it doesn't bother you you that the weapon could break in half along the join and go whizzing across the room and smash into something? Or that since those tanks are probably made of mild steel that 1 good hit will twist them irreparably, ripping itself from its mounts and again breaking free of its mounts.
Also welding your teeth on doesn't work. The forces are too great. Your welds WILL shear. You must dovetail or bolt them in with extra support and even that isn't reliable. If you hit something and they break off those chunks will be going fast enough to kill you if they hit you.