The debeader is made up of a number of components, including the debeading head, 12 or 15 metres of Aluminium rod and appropriate centring rings. The head is entered into the pipe and pushed forward until it encounters the weld bead, then counter-rotated to engage the blade. A handle at the other end is rotated until the bead has been sliced out, the head is withdrawn, and the cut bead has been retained by the cutting head. Whatever you do you must remove the weld bead withing the first half of the cooling time. Trying to remove a cold bead is useless, will potentially damage the tool, and might mean that you have to do the weld and bead removal again.