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B-3
OPERATION
B-3
MAGNUM™ PRO 350 and 550 FUME GUNS
PREPARE THE FUME GUN FOR
WELDING (Also See Installation Section)
• Read all safety information in this Instruction
Manual.
• Verify that input power to the machine and the wire
feeder is disconnected.
LOAD SPECIFIED WIRE INTO THE
GUN
1. Refer to welding wire literature for proper machine
and feeder settings and proper usage.
2. Select specified welding wire.
3. Load specified welding wire into the feeder.
4. Connect the gun to the welding machine per the
Installation Section.
5. Reconnect power to the welding machine and wire
feeder.
6. Feed wire through the gun and contact tip. It may
be necessary to temporarily remove the contact tip
to feed wire. Reinstall the tip if it was removed.
MAKE THE WELD
1. Obtain and use the proper personal protective
equipment for welding. See Safety Precautions in
the Installation Section and at the beginning of
this Instruction Manual.
2. Cut off the wire so that it extends about 1/4 inches
from the contact tip.
3. Verify that the input power is connected to the
machine and wire feeder.
4. Flip the machineʼs and feederʼs power switches to
“on”.
5. Flip the fume extractorʼs power switch to “on”. Set
the extractor to the correct operating speed.
6. CTWD (contact tip to work distance) and push
(GMAW) or drag (FCAW) angle: Read the filler wire
instructions to determine the correct CTWD and
angle values for the selected welding procedure
and position the gun accordingly. The protruding
welding wire should not contact the workpiece.
7. Protect the eyes and pull the trigger to begin weld-
ing.
8. Adjust the hand travel speed of the gun to achieve
a proper weld. The emerging wire should stay with-
in the molten puddle and not overrun it. This speed
also should not be so slow that either the workpiece
excessively melts, or that the weld bead becomes
excessively large.
9. Release the trigger to stop welding.
10. Fume collection system or gate valve to the gun
may be shut off or closed after the gun has cooled
for 10 minutes since the last weld.