Quantcast Figure 7-53.Air carbon-arc cutting.

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Figure 7-53.—Air carbon-arc cutting. metal.  Figure  7-53  shows  the  process.  The  equipment consists of a special holder, as shown in figure 7-54, that uses  carbon  or  graphite  electrodes  and  compressed  air fed through jets built into the electrode holder. A push button or a hand valve on the electrode holder controls the air jet. The air jet blows the molten metal away and usually leaves  a  surface  that  needs  no  further  preparation  for welding. The electrode holder operates at air pressures varying between 60 and 100 psig. During use, bare carbon or graphite electrodes be- come smaller due to oxidation caused by heat buildup. Copper  coating  these  electrodes  reduces  the  heat buildup and prolong their use. The  operating  procedures  for  air  carbon-arc  cutting and gouging  are basically the same. The procedures are as  follows: l l l l l Adjust the machine to the correct current for electrode  diameter. Start the air compressor and adjust the regulator to the correct air pressure. Use the lowest air pressure  possible-just  enough  pressure  to  blow away the molten metal. Insert the electrode in the holder. Extend the carbon electrode 6 inches beyond the holder. Ensure  that  the  electrode  point  is  properly shaped. Strike the arc; then open the air-jet valve. The air-jet  disc  can  swivel,  and  the  V-groove  in  the disc  automatically  aligns  the  air  jets  along  the electrode. The electrode is adjusted relative to the holder. Control the arc and the speed of travel according to the shape and the condition of the cut desired. Figure  7-54.—Air  carbon-arc  electrode  holder  with  carbon  electrode  installed. 7-31

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