®
MISON shielding gases.
Shield the weld and the welder.
2
With MISON® shielding gases productivity and a good working environment go hand in hand.
MISON is a complete range of Linde shielding gases designed to improve the quality and productivity of almost any
welding application. Due to their capacity to reduce the level of ozone in a welding area, MISON shielding gases provide
an excellent foundation for other efforts to improve the working environment of welders.
The distinctive smell of ozone is familiar to most welders. And most welders
know that ozone is hazardous to their health. It causes headaches and
sensations of dryness and irritation in the eyes, nose and throat. It makes
welders feel as if they’ve caught a common cold. Even very low levels
of ozone have harmful effects, as the Threshold Limit Value (TLV) is very
small. Even concentrations of ozone below the TLV are usually considered
unpleasant, resulting in a distraction that reduces productivity. This is why
the ability of MISON® shielding gases to reduce the amount of hazardous
ozone, while at the same time improving the quality of a weld, will boost
productivity in more ways than one.
MISON® – nature’s way of reducing ozone formation
The addition of a small portion of Nitric oxide (NO) to a shielding gas
reduces the amount of ozone formed. The reaction between ozone and NO
is natural and occurs, to a limited degree, in all welding. When the reaction
is enhanced by the shielding gas, NO readily reacts with the ozone to form
Oxygen (O2) and Nitrogen dioxide (NO2). The Nitric oxide content (NO <
300 ppm) of MISON gases is enough to effectively reduce the amount of
ozone formed in the welding process. The small amounts of Nitrogen dioxide
produced in the enhanced welding process are a result of ozone reduction
and are acceptable. The addition of NO to shielding gases does not affect
the mechanical properties or the corrosion resistance of welds. In fact, the
opposite is true. In TIG and MIG welding, the NO content in the shielding
gas produces a more stable arc and makes it easier to control the welding
process. And since the stability of an arc always decreases with an increasing
amount of Helium in the Argon shielding gas, adding NO stabilizes the arc
making positional welding easier.
4
Short Arc
Spray arc
Mixed arc
3
2
Standard Shielding gas
1
MISON® shielding gas
0
100
200
300
Mison reduces ozone formation in most types of welding.
Mison attacks when and where ozone is formed. The nitric oxide content
of mison gases reacts with the ozone formed by the UV radiation emitted
by the arc to form oxygen and nitrogen dioxide. The result is a significantly
lower content of ozone pollutants in the welder‘s immediate area.
More on welding and a welder’s health
All welding generates hazardous pollutants in the form of fumes and gases. Their amounts produced depend on various factors, such as the welding
method, the material welded, filler metal, welding parameters and the shielding gas used. Fume particles consist of metal oxides. These are formed when
the melted metal is vaporized in the arc and then condenses and oxidizes upon contact with the surrounding air. The most hazardous fumes are considered
to consist of Nickel and chromium compounds that are formed during the welding of stainless steel. Ozone is one of the most hazardous and harmful gases
formed during TIG and MIG MAG welding. As a general rule, the brighter the arc and the lesser the fume production, the higher the ozone production is
likely to be. Other gaseous impurities resulting from the extremely high temperatures and ultraviolet radiation emitted by the arc are Carbon monoxide (CO)
and Nitrogen oxides. Most of the ozone is generated in the air layer closest to the arc and the concentration is highest in the hot plume of fumes and gases
that rise from the welding spot. The highest ozone concentrations are generated in the MIG welding of Aluminium. Ozone concentration in the plume is very
high (4-10 ppm) as it also is in the TIG and MIG/MAG welding of stainless steels and the MAG welding of ”black“ steel.
Ozone
concentration
0,05
01
Symptom
Ozone can be smelled TLV8h /ppm (2002) = 0.05 ppm
Feeling of dryness and irritation
0.1 - 0.3
Coughing, shortness of breath, chest pains
0.1 - 3.0
Increasing of the above symptoms; headache
3.0
As mentioned above, breathing difficulties
Typical symptoms of ozone concentrations.
Ozone
concentration
ozone O3
Nitrogen dioxide NO2
Nitric oxide NO
Carbon monoxide CO
Carbon dioxide CO2
Symptom
0.05
3
25
30
5000
TLVS of gaseous air pollutants formed during welding, ministry of labour, 2002.
3
Whatever your welding needs, there’s a MISON® shielding gas to match.
MISON shielding gases reduce the amount of ozone formed during welding and improve a welder‘s working conditions.
The addition of Nitric oxide into the shielding gas does not affect the mechanical properties or corrosion resistance of
welds. In TIG and MIG welding, the NO content in the shielding gas provides a more stable arc and makes it easier to
control the welding process.
MISON® Ar (Ar + 0.03% NO)
Shielding gases EN 439-S M21 + 0.03 NO, group M21
An all-round choice for TIG welding that provides an easy-to-strike and stable
arc. For the MIG welding of Aluminium, high-alloy stainless steels and Copper
and Nickel alloys. Stable process without spatter. Very good for the MIG
brazing of galvanized steels.
Shielding gases EN 439-S I1 + 0.03 NO, group I1
MISON® 2C (Ar + 2% CO2 + 0.03% NO)
An all-round gas for the MAG welding of austenitic and ferric stainless steels,
as well as for standard duplex steels. For short arc, spray arc and pulsed arc.
Low spatter and surface slag. Flat weld beads.
Shielding gases EN 439-S M12 + 0.03 NO, group M12
MISON® 8C (Ar + 8% CO2 + 0.03% NO)
For the MAG welding of unalloyed and low-alloy steels with solid and metalcored wires. It’s mainly intended for spray arc and pulsed arc. Provides high
welding speed, little spatter and surface slag, low weld reinforcement and
efficient electrode consumption. It’s the best choice for high-productivity
welding with robots and other mechanized processes.
Shielding gases EN 439-S M21 + 0.03 NO, group M21
MISON® 15C (Ar + 15% CO2 + 0.03% NO)
Unalloyed/low alloyed steel
TIG
Stainless steel, Austenitic
Stainless steel, Duplex
Aluminium and alloys
Copper and alloys
Titanium
MIG/MAG
Unalloyed/low alloyed steel
Stainless steel, Austenitic
Stainless steel, Duplex
Aluminium and alloys
Copper and alloys
MISON® 25C
MISON® 15C
MISON® 8C
MISON® 2C
Alternative. May in some cases
be advantageous.
MISON® He30
Recommended
MISON® Ar
For the MAG welding of unalloyed and low-allow steel with solid and
fluxcored wires. Suitable, with certain exceptions, for pulsed welding and
for the welding of stainless steel with rutile flux-cored wires. Low weld
reinforcement and little spatter in all modes of arc transfer. An all-round gas
for a wide variety of applications.
MISON® 25C (Ar + 25% CO2 + 0.03% NO)
For the MAG welding of unalloyed and low-alloy steel with solid and
fluxcored wires and for the welding of stainless steel with rutile flux-cored
wires. Good fluidity of the weld pool in short-arc welding. Excellent resistance
to impurities in spray-arc welding. Especially preferred in short-arc and sprayarc welding when there are tightness requirements.
Shielding gases EN 439-S M21 + 0.03 NO, group M21
MISON® He30 (Ar + 30% He + 0.03% NO)
For the TIG welding and MIG welding of some high-alloy stainless steels,
Nickel alloys, Aluminium and Copper. Helium provides a very good fluidity of
the weld pool, better penetration, higher welding speed and a lower need for
preheating.
Shielding gases EN 439-S I3 + 0.03 NO, group I3
MISON® liquid (Ar + 0.03% NO)
A shielding gas supplied in liquid form. It has the same properties as MISON
Ar. Suitable for being mixed (in a mixer) with Carbon dioxide and/or Helium
to form various mixtures. It makes it possible for those using liquid gas to
benefit from the improvements provided by MISON shielding gases in their
working environments.
Shielding gases EN 439-S I1 + 0.03 NO, group I1
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