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Cutting and Beveling Pipe

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Figure 4-27.—Cutting pipe with an oxygas cutting torch. you  should  do  the  following:  promptly  turn  off  the cutting oxygen, turn off the current, and extinguish the flame-in that order. The cutting speed depends upon the thickness of the steel being cute CUTTING AND BEVELING PIPE Pipe cutting with a cutting torch requires a steady hand to obtain a good bevel cut that is smooth and true. Do not attempt to cut and bevel a heavy pipe in one operation  until  you  have  developed  considerable  skill. First, you should cut the pipe off square, and ensure all the slag is removed from the inside of the pipe. Next, you should bevel the pipe. This procedure produces a cleaner and better job; it is ideal for use by an inexperi- enced  Steelworker. When cutting a piece of pipe, you should keep the torch pointed toward the center line of the pipe. Start the cut at the top and cut down one side. Then begin at the top again and cut down the other side, finishing at the bottom of the pipe. This procedure is shown in figure 4-27. When you make T and Y fittings from pipe, the cutting torch is a valuable tool. The usual procedure for fabricating pipe fittings is to develop a pattern like the one shown in figure 4-28, view A-1. After  you  develop  the  pattern,  wrap  it  around  the pipe, as shown in figure 4-28, view A-2. Be sure to leave enough material so the ends overlap. Trace around the pattern with soapstone or a scribe. It is a good idea to mark the outline with a prick punch at 1/4-inch intervals. During the cutting procedure, as the metal is heated, the punch marks stand out and make it easier to follow the line of cut. Place the punch marks so the cutting action will remove them. If punch marks are left on the pipe, they could provide notches from which cracking may Starte An experienced Steelworker can cut and bevel pipe at a 45-degree angle in a single operation. A person with little cutting experience should do the job in two steps. Figure 4-28.—Fabricating a T. In that case, the first step involves cutting the pipe at a 90-degree angle. In the second step, you bevel the edge of  the  cut  to  a  45-degree  angle.  With  the  two-step procedure, you must mark an additional line on the pipe. This  second  line  follows  the  contour  of  the  line  traced around the pattern, but it is drawn away from the original pattern line at a distance equal to the thickness of the pipe  wall.  The  first  (90-degree)  cut  in  the  two-step procedure is made along the second line. The second (45-degree) cut is made along the original pattern line. The primary disadvantage of the two-step procedure is . it  is  time  consuming  and  uneconomical  in  oxygen  and gas  consumption. The  one-step  method  of  cutting  and  beveling  pipe is not difficult, but it does require a steady hand and a 4-19



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