Lincoln Electric AIR VANTAGE 800 (AU) CUMMINS Operator's Manual page 26

AIR VANTAGE ® 800 (AU) CUMMINS
WELDER OPERATION
DUTY CYCLE
Duty Cycle is the percentage of time the load is being applied in a
10 minute period. For example a 60% duty cycle, represents 6
ELECTRODE INFORMATION
minutes of load and 4 minutes of no load in a 10 minute period.
For any electrode the procedures should be kept within the rating
of the machine. For information on electrodes and their proper
application see (www.lincolnelectric.com) or the appropriate
Lincoln publication.
The AIR VANTAGE ® 800 (AU) CUMMINS can be used with a broad
range of DC stick electrodes. The MODE switch provides two stick
welding settings as follows:
Constant Current (CC-STICK) Welding
The CC-STICK position of the MODE switch is designed for
horizontal and vertical-up welding with all types of electrodes,
especially low hydrogen.
The ARC CONTROL dial sets the short circuit current (arc-force)
during stick welding to adjust for a soft or crisp arc. Increasing the
number from -10(soft) to +10(crisp) increases the short circuit
current and prevents sticking of the electrode to the plate while
welding. This can also increase spatter. It is recommended that
the ARC CONTROL be set to the minimum number without
electrode sticking. Start with the dial set at 0.
Note: Due to the low OCV with the VRD on, a very slight delay
during striking of the electrodes may occur. Due to the
requirement of the resistance in the circuit to be low for a VRD to
operate, a good metal-to-metal contact must be made between
the metal core of the electrode and the job. A poor connection
anywhere in the welding output circuit may limit the operation of
the VRD. This includes a good connection of the work clamp to
the job. The work clamp should be connected as close as
practical to where the welding will be performed.
A. For New Electrodes
E6010 - Touch, Lift to Start the Arc.
E7018, E7024 - Touch, Rock Back and Forth in Joint, Lift.
Once the arc is started, normal welding technique for the
application is then used.
B. For Re-Striking Electrodes
Some electrodes form a cone at the end of the electrode after the
welding arc has been broken, particularly iron powder and low
hydrogen electrodes. This cone will need to be broken off in order
to have the metal core of the electrode make contact.
E6010 - Push, Twist in Joint, Lift
E7018, E7024 - Touch, Rock Back and Forth in Joint, Lift.
Once the arc is started, normal welding technique for the
application is then used.
For other electrodes the above techniques should be tried first and
varied as needed to suit operator preference. The goal for
successful starting is good metal to metal contact.
For indicator light operation, see Table B.1.
DOWNHILL PIPE Welding
This slope controlled setting is intended for "out-of-position" and
"down hill" pipe welding where the operator would like to control
the current level by changing the arc length.
The ARC CONTROL dial sets the short circuit current (arc-force)
during stick welding to adjust for a soft or more forceful digging
arc (crisp). Increasing the number from -10(soft) to +10(crisp)
increases the short circuit current which results in a more forceful
digging arc.
Typically a forceful digging arc is preferred for root and hot
passes. A softer arc is preferred for fill and cap passes where
weld puddle control and deposition ("stacking" of iron) are key to
fast travel speeds. This can also increase spatter.
It is recommended that the ARC CONTROL be set to the minimum
number without electrode sticking. Start with the dial set at 0.
NOTE: With the VRD switch in the "ON" position (See figure A.1 for
location) there is no output in the downhill pipe mode. For
indicator light operation, see Table B.1.
B-7
OPERATION