Welder Operation - Lincoln Electric Dual Maverick 200 Operator's Manual

DUAL MAVERICK ® 200/200X

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 within the rating
of the machine. For information on electrodes and their proper
application see (www.lincolnelectric.com) or the appropriate
Lincoln publication.
The Dual Maverick ® 200/200X 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
Stick "Mode" is designed for horizontal and vertical-up welding
with all types of electrodes, especially low hydrogen.
The ARC Force setting on the mode screen controls 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 (OFF).
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.
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 - To begin welding with VRD active.
E7018, E7024 - Tap, slide and lift in one motion.
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.
DOWNHILL PIPE Welding
This slope controlled mode 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 FORCE setting 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 FORCE be set to the minimum
number without electrode sticking. Start with the setting at 0.
NOTE: With the VRD set to the "ON" position (See Figure A.2 for
location) there is no output in the downhill pipe mode.
Electrode
Work Lead
B-4
OPERATION
+ _
+ _
Electrode
Work Lead