Laserfiche WebLink
<br /> Page 39 <br /> <br /> Verify that pipe ends are squarely faced with the facing tool of the fusion welding <br />machine. <br /> <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 /> <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 /> <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 2-inch and below 1/16-inch 3-inch to 5-inch 1/18-inch 5-inch to 12-inch 3/1-6-inch 12-inch to 22-inch 1/4-inch to 5/16-inch 24-inch to 54-inch 5/16-inch to 7/16-inch <br /> <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 /> <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 /> <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 />