Section 15 − Mig Welding (Gmaw) Guidelines; Typical Mig Process Connections Using A Voltage-Sensing Wire Feeder; Holding And Positioning Welding Gun - Miller Electric Bobcat 250 Owner's Manual

SECTION 15 − MIG WELDING (GMAW) GUIDELINES

15-1. Typical MIG Process Connections Using A Voltage-Sensing Wire Feeder

Gun
Workpiece
Work Clamp Voltage
Sensing Clamp

15-2. Holding And Positioning Welding Gun

.
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.
5
90 90
End View Of Work Angle
GROOVE WELDS
Voltage
Sensing Wire
Feeder
1
2
4
0 -15
Side View Of Gun Angle
Constant
Current (CC)
Or Constant
Voltage (CV)
Power Source
Electrode Lead
Work Lead
3
45
45
End View Of Work Angle
FILLET WELDS
!
Weld current can damage
electronic parts in vehicles.
Disconnect both battery
cables before welding 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 con-
tactor.
For GMAW, use optional gas valve.
802 488
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
0 -15
Side View Of Gun Angle
S-0421-A
OM-4419 Page 63