as needed to properly locate itself cylindrically with the grooves of the respective rings the inside diameter of the ring groove is the controlling factor for the finished screen cylinder 39 s inside dimensions the lap joint will remain fixed once the screen media sections are placed into the captive ring grooves after the cylinder is completely assembled the tie rods hold the assembly together because of the shape of the grooves and groove ears assembly can be accomplished without the use of a large press machine as is needed with beloit 39 s belwave u2122 design in those applications where tie rods are not necessary the outside surface of the screen sections can be lightly welded to the support rings these light welds are unlike the large weld seam of the prior art screens the small amount of welding necessary to connect the outside surface of the screen section to the support ring will not induce any significant amount of thermal stresses into the screen unlike the large weld seam of the prior art screens which induces a significant amount of thermal stresses into the screens these welds will not affect the inside screening surface of the cylinder as a result these welds will not require the cylinder to be further finish ground or.