Lincoln Electric IM642 IDEALARC DC-600 - Manual (Page 23)

• 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.
ARC STRIKING WITH IDEALARC® DC-600 AND THE
NA-3 START BOARD
When electrical strikeouts exceed 1 3/4” (44.4mm) an
NA-3 Start Board may be required to improve arc strik-
ing.
When the NA-3 Start Board is used to improve arc strik-
ing, use the following procedures:
1.
Set start time at 0.
2. Set NA-3 start current and start voltage at mid-
range.
3. Set the NA-3 output current and voltage to the prop-
er settings for the welding procedure to be used.
4. Turn the Start Board Timer to maximum.
5. Set Start Board current and voltage control.
• Set the Start Board current control to 1 1/2 dial num-
bers below that set on the NA-3 current control.
• Set the Start Board voltage control equal with the
NA-3 voltage control setting.
B-7 OPERATION B-7
IDEALARC® DC-600
NA-3 AUTOMATIC WIRE FEEDER
1. Set the IDEALARC® DC-600 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 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 mode select-
ed 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.
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 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 varies from approximately 16
volts to 56 volts in the CV INNERSHIELD or CV
SUBMERGED ARC modes. The open circuit voltage
is constant 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.