Protection Gases Guide; Welding Hints And Maintenance - Helvi MULTITECH 365 Manual De Uso

METAL GAS
Mild steel CO2
Argon + CO2
Argon + CO2 + Oxygen
M i l d s t e e l - 98%Argon + 2% CO2 (C2) Recommended.
Pulsed Mode
Aluminium Argon
Argon + Helium
Stainless steel 98%Argon + 2% CO2 (C2)
80% Argon + 20% CO2
Argon + CO2 + Oxygen
Argon + Oxygen
Copper, Nickel Argon
and Alloys Argon + Helium
Table 6
Contact the technical service of your gas supplier to know the percentages of the different gases which are
the most suitable to your application.

WELDING HINTS AND MAINTENANCE

• Always weld clean, dry and well prepared ma-
terial.
• Hold gun at a 45° angle to the workpiece with
nozzle about 5 mm from the surface.
• Move the gun smoothly and steadily as you
weld.
• Avoid welding in very drafty areas. A weak
pitted and porous weld will result due to air
blowing away the protective welding gas.
• Keep wire and wire liner clean. Do not use ru-
sty wire.
• Sharp bends or kinks on the welding cable
should be avoided.
• Always try to avoid getting particles of me-
tal inside the machine since they could cause
short circuits.
• If available, use compressed air to periodically
clean the hose liner when changing wire spools

PROTECTION GASES GUIDE

NOTE
High Penetration
Argon controls spatters
Oxygen improves arc stability
Arc stability, good fusion and minimum spatter.
Higher heat input suitable for heavy sections. Minimum porosity.
Recommended.
Arc stability.
Minimum spatter.
Suitable for light gauges because of low flowability of the weld pool.
Higher heat input suitable for heavy sections.
IMPORTANT: Disconnect from power
source when carrying out this operation.
• Using low pressure air (3/5 Bar=20-30 PSI),
occasionally blow the dust from the inside of
the welder. This keeps the machine running
cooler. Note: do not blow air over the printed
circuit board and electronic components.
• The wire feed roller will eventually wear du-
ring normal use. With the correct tension the
pressure roller must feed the wire without slip-
ping. If the pressure roller and the wire feed
roller make contact (when the wire is in place
between them), the wire feed roller must be
replaced.
• Check all cables periodically. They must be in
good condition and not cracked.
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