OPERATION |
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Cutting Expanded Metal
1.Cut expanded metal with OUTPUT CURRENT CONTROL set near the mid- range position using the same methods listed under Cutting Thin Gauge Metal. Keep the following points in mind:
a.Place a thin piece of scrap metal over the area to be cut and then cut through both to make cutting easier.
b.After 30 seconds of cutting expanded metal, the pilot arc changes from a bright continuous arc to an arc that
rapidly goes on and off. This produces a slight spatter. You can still cut metal when this condition occurs as long as metal has been cut in the last five seconds. If metal is not cut in this condition for more than five seconds, the arc shuts off and the machine goes into postflow.
c.The pilot arc duty cycle is 20 seconds out 80 seconds. If the torch trigger is continuously pulled and released to obtain a bright, continuous arc, the duty cycle limit will be reached and the arc will be turned off for the duty cycle limit. When the arc is turned off, the OUTPUT ON and FAULT LEDs flash alternately.
Cutting Thick Sections of Metal
1.Set the OUTPUT CURRENT CONTROL above the
a.Use the minimum current needed to make a satisfactory cut.
2.Hold the torch nozzle about 1/8" (3.2mm) from the cutting surface. Do not let the torch nozzle touch the work or carry a long arc.
a.Use the S24114 Drag Cup to protect the torch.
b.Use only the .052" (1.3mm) or the .042" (1.0mm) nozzles. Do not use the .035"
(0.8mm) nozzle for cutting thick sections of metal.
3.Start the cut from the edge of the work piece when possible. Pierce the work piece by slow- ly lowering the torch onto the metal at a 300 angle. This will blow the dross away from the torch tip. Slowly rotate the torch to vertical position as the arc becomes deeper. See Figure B. 2.
4.Keep moving while cutting. Cut at a steady speed without pausing.
| TORCH AT 300 ANGLE |
| TO PIERCE |
| ROTATE TO |
300 | 900 ANGLE TO CUT |
| 900 |
| VERTICAL ANGLE |
| FOR CUTTING |
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CUT
FIGURE B.2 -- Cutting Thick Piece of Metal.
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