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• Verify that pipe ends are squarely faced with the facing tool of the fusion welding <br /> machine. <br /> • Verify that pipe ends line up in the fusion welding machine and that the pipe ends meet <br /> squarely and completely over the entire surface to be welded. Verify at this point that the <br /> pipe is securely clamped into place so that the pipe does not move during the fusion <br /> welding process. <br /> • Verify that the heater plate is clean and maintains the appropriate temperature. Verify <br /> that the heater plate is inserted between the aligned pipe ends and that the pipe ends are <br /> firmly brought into contact with the heater plate. NO PRESSURE should be applied to <br /> achieve the melt pattern. <br /> • Verify that the pipe ends are allowed to heat and soften. As the pipe heats and softens a <br /> melt bead begins to roll back from the contact point of the heater plate and the pipe ends. <br /> Approximate diameter size of melt beads for various sizes of pipe are as follows: <br /> Pipe Size Diameter of Melt Bead <br /> 2-inch and below 1/16-inch <br /> 3-inch to 5-inch 1/1 8-inch <br /> 5-inch to 12-inch 3/1-6-inch <br /> 12-inch to 22-inch 1/4-inch to 5/16-inch <br /> 24-inch to 54-inch 5/16-inch to 7/16-inch <br /> • Verify that the heater plate is removed quickly and cleanly when the appropriate melt <br /> bead is achieved and that no melted pipe material sticks to the heater plate. If melted <br /> material sticks to the heater plate,verify that this joint is discontinued,the heater plate is <br /> cleaned, the pipe ends are re-faced, and that the joint is re-started. <br /> • Verify that the melted pipe ends are rapidly joined together and that enough pressure is <br /> applied to the joint to form a melt bead 1/8-inch to 3/16-inch in diameter around the <br /> entire circumference of the pipe. Pressure is critical to cause the heated material of each <br /> pipe end to flow together. <br /> • Verify that the joint is allowed to cool and solidify properly before the pipe is released <br /> from the fusion welding machine. Cooling and solidification is completed when your <br /> finger can remain comfortably on the bead. <br /> Page 48 <br />