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FLUX CORED FUME GUN
2
Welding conditions will affect the air flow required for
adequate smoke removal.
1. At the same welding currents, NS-3M electrodes
require less air flow than NR-311 electrodes.
2. Horizontal and position fillet welds require less air
flow than lap or open butt welds.
3. Welds exposed to drafts require more air flow than
welds made in still air.
4. Welds made at higher welding current require
more air flow than welds made at lower welding
current.
The following additional lengths of E2123-2 1.25 inch
inside diameter hose can be used on the K206 Flux
Cored Fume Gun gun and still maintain good smoke
pickup.
65 ft.(20m) when one gun is used on K184 vacuum unit
35 ft.(11m) when one gun is used on K179 vacuum unit
Extension guides (which include the spatter shield)
and nozzle contact tips wear or deteriorate while weld-
ing. Replace as needed.
MAINTENANCE
To ensure proper smoke pickup and gun life, the
intake ports and end of extension guide must be kept
free of spatter. A piece of wire is recommended to
keep intake ports and I.D. of extension guide free of
spatter and smoke buildup.
The following cleaning schedule is recommended:
Maintenance
Recommended
Clean intake ports and
I.D. of extension guide
with wire. Remove spat-
ter from bottom of exten-
sion guide.
With vacuum off, remove
extension guide and clean
I.D. of housing and clean
nozzle spacer.
Break loose any particles
built up at bend or clamp
in intake housing with a
piece of wire or electrode
Electrode
Usage
Arc time in hours.
Lbs. of electrode
Lbs. of electrode
3/32”NS-3M
350 Amp
Horizontal Welds
2.8
50
500 to 1000
Other Electrodes
350 Amp
Horizontal Welds
2
25
500 to 1000
NR-202, NR-203
200 Amp
Vertical Welds
1
6
500 to 1000
Do not let spatter accumulate on end of extension guide. Clean as necessary.
Failure to keep extension guide free of spatter will make extension guide electrically
hot and it will arc to work.
Use of S16869 and M13800 Extension Guides
The I.D. of the extension guide, the I.D. of the steel adapter and the nozzle spacer must be kept free of excessive
spatter to maintain air flow through the gun. On high current welding with NR-211MP, these parts usually require
cleaning after 5 minutes of arc time. Spatter will also collect around nozzle support in the intake housing and
should be cleaned every coil of electrode used, unless more frequent cleaning is indicated.
TROUBLESHOOTING
Trouble Cause Remedy
Poor smoke pickup Vacuum unit not operating correctly. Clean filters or repair vacuum unit.
Spatter buildup on intake ports, I.D. of Remove spatter and clear all passages.
extension guide or I.D. of intake housing.
Hoses blocked or damaged. Clean or repair hoses.
Strong drafts. Eliminate strong drafts or construct barriers
so draft will not affect smoke removal.
Visible stickout is too long. Shorten visible stickout to
recommended length.
Poor arc action or erratic feeding. Worn contact tip or nozzle. Replace worn parts.
Dirty cable. Blow out cable with compressed air.
When intake ports are 50% plugged.
MAR97