Miller Bobcat 250 Diesel, Owner'S Manual

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OM-258413 Page 64
SECTION 13 − GMAW WELDING (MIG) GUIDELINES WHEN
USING A VOLTAGE-SENSING FEEDER
13-1. Typical GMAW (MIG) Process Connections Using A Voltage-Sensing Wire Feeder
!
Weld current can damage
electronic parts in ve-
hicles. Disconnect both
battery cables before weld-
ing on a vehicle. Place work
clamp as close to the weld
as possible.
Voltage sensing wire feeders are
used with constant current (CC)
or constant voltage (CV) power
sources (14 pin receptacle not re-
quired).
If using a CC or CV welding power
source without a weld output con-
tactor, use optional secondary
contactor.
.
For GMAW, use optional gas
valve.
Voltage
Sensing Wire
Feeder
Constant
Current (CC)
Or Constant
Voltage (CV)
Welding
Power Source
Work Lead
Electrode Lead
Workpiece
Work Clamp Voltage
Sensing Clamp
Gun
GMAW2 2018−12 (Voltage Sens) − 802 488
.
Welding wire is energized
when gun trigger is pressed.
Before lowering helmet and
pressing trigger, be sure wire is
no more than 1/2 in. (13 mm)
past end of nozzle, and tip of
wire is positioned correctly on
seam.
1 Hold Gun and Control Gun
Trigger
2 Workpiece
3 Work Clamp
4 Electrode Extension (Stickout)
1/4 to 1/2 in. (6 To 13 mm)
5 Cradle Gun and Rest Hand on
Workpiece
2
3
5
4
90
°
90
°
0
°
-15
°
45
°
45
°
End View Of Work Angle Side View Of Gun Angle
End View Of Work Angle Side View Of Gun Angle
1
0
°
-15
°
S-0421-A
13-2. Holding And Positioning Welding Gun
Groove Welds
Fillet Welds