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One of our finished welds is shown here, followed by grinding and smoothing, and finally, polishing. The main goal is to lay down uniform beads, so that no seams will show after polishing. If you do end up with some gaps (or craters in the seams), go back and fill them in after your initial grinding process. Finally, if you don't have access to an internal bead roller, lay a uniform bead of weld all around each the end of the tube, to act as a stop (or shoulder) for your clamps to butt up against (just like those on your radiator inlet/outlet or thermostat housing).