3.Air/Carbon Arc Cutting (AAC) / Stick Welding (SMAW) / High Current, Large Puddle Submerged Arc Welding (SAW): Use the CC STICK mode. When the IDEALARC® DC-600 VRD is used for Air/Carbon Arc cutting, the OUTPUT CONTROL potentiometer should be set to "9" initially. Based on the size of the carbon being used or the process, turn the potentiometer to a lower setting as required by the process. You can use carbon rods up to 3/8" in diameter at currents as high as 750 amps with excellent arc control. The welder protection circuit protects the machine from extremely high short circuiting pulses.
SEMI-AUTOMATIC AND AUTOMATIC WIRE FEEDING WITH THE IDEALARC® DC-600 VRD AND WIRE FEEDERS
When using the IDEALARC® DC-600 VRD with semi- automatic or automatic wire feeding equipment and for stick welding or air/carbon arc cutting, it is recom- mended that the optional MULTI-PROCESS SWITCH be used. This switch permits you to easily change the polarity of the connected wire feeding equipment or switch to stick welding or air/carbon arc cutting.
NA-3 AUTOMATIC WIRE FEEDER
1.Set the IDEALARC® DC-600 VRD LOCAL/REMOTE Switch to REMOTE. Set the OUTPUT TERMINALS switch to REMOTE. NOTE: Later model NA-3 auto- matic wire feeders are capable of cold starts when the NA-3 Mode switch is in the CV or CC mode posi- tion. Some earlier models are capable of cold start- ing only in the CC mode position. Cold starting enables you to inch the wire down to the work, auto- matically stop, and automatically energize the flux hopper valve.
2.Set the IDEALARC® DC-600 VRD welding mode switch for the desired process: CV SUBMERGED ARC, CV INNERSHIELD mode or CC STICK mode.
3.Set the NA-3 mode Switch Position to either CV or CC to match the IDEALARC® DC-600 VRD mode selected in step 2.
4.Refer to the NA-3 operators manual for instructions on how to use the NA-3 in conjunction with the IDE- ALARC® DC-600 VRD.
5.Follow the following guidelines for good arc striking detailed below for each welding mode.
GOOD ARC STRIKING GUIDELINES FOR THE NA-3 WITH THE IDEALARC® DC-600 VRD IN THE CV INNERSHIELD, CV SUbMERGED ARC OR CC STICK WELDING MODES.
Following are some basic arc striking techniques that apply to all wire feed processes. Using these procedures should provide trouble-free starting. These procedures apply to single, solid wires and Innershield wires.
1.Cut the electrode to a sharp point.
2.Set the NA-3 Open Circuit Voltage Control to the same dial setting as the Arc Voltage Control. If this is a new welding procedure, a good starting point is to set the Open Circuit Voltage Control to # 6.
NOTE: The open circuit voltage of the IDEALARC® DC-600 VRD varies from approximate- ly 16 volts to 56 volts in the CV INNERSHIELD or CV SUBMERGED ARC modes. The open circuit voltage is essentially zero in the CC STICK mode.
3.Run a test weld. Set proper current, voltage, and travel speed.
•For the best starting performance, the NA-3 Open Circuit Voltage Control and Voltage Control setting should be the same. Set the Inch Speed Control for the slowest inch speed possible.
•To adjust the Open Circuit Voltage Control to get the best starting performance, make repeated starts observing the NA-3 voltmeter.
When the voltmeter pointer swings smoothly up to the desired arc voltage, without undershooting or overshooting the desired arc voltage, the Open Circuit Voltage Control is set properly.
If the voltmeter pointer overshoots the desired volt- age and then returns back to the desired voltage, the Open Circuit Voltage Control is set too high. This can result in a bad start where the wire tends to "Blast off."
If the voltmeter pointer hesitates before coming up to the desired voltage, the Open Circuit Voltage Control is set too low.This can cause the electrode to stub.
4.Start and make the weld.
•Cold starts. For cold starts, be sure the work piece is clean and the electrode makes positive contact with the work piece.
•Hot "On the Fly" starts. For hot starts, travel should begin before the wire contacts the work piece.
