Lincoln Electric DUAL VANTAGE 700, Operator'S Manual

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B. For Re-Striking Electrodes
Some electrodes form a cone at the end of the elec-
trode after the welding arc has been broken, particu-
larly 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 prefer-
ence. 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-posi-
tion" 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 pass-
es 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 DOWN-
HILL PIPE mode. For indicator light operation, see
Table B.1.
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 minutes of load and 4 minutes of no
load in a 10 minute period.
ELECTRODE INFORMATION
For any electrode the procedures should be kept with-
in the rating of the machine. For information on elec-
trodes and their proper application see (www.lincoln-
electric.com) or the appropriate Lincoln publication.
The DUAL VANTAGE
®
700 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) increas-
es 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 connec-
tion 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-7
OPERATION DUAL VANTAGE ® 700