MISON 8C Shielding Gas Family135 99115

7/27/2019 MISON 8C Shielding Gas Family135 99115

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MISON

®

shielding gases.Shield the weld and the welder.



The distinctive smell of ozone is familiar to most welders. And most weldersknow that ozone is hazardous to their health. It causes headaches andsensations of dryness and irritation in the eyes, nose and throat. It makeswelders feel as if they’ve caught a common cold. Even very low levelsof ozone have harmful effects, as the Threshold Limit Value (TLV) is verysmall. Even concentrations of ozone below the TLV are usually consideredunpleasant , resulting in a distraction that reduces productivity. This is whythe ability of MISON® shielding gases to reduce the amount of hazardousozone, while at the same time improving the quality of a weld, will boostproductivity 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 gasreduces the amount of ozone formed. The reaction between ozone and NO

is natural and occurs, to a limited degree, in all welding. When the reactis enhanced by the shielding gas, NO readily reacts with the ozone to foOxygen (O2) and Nitrogen dioxide (NO2). The Nitric oxide content (NO300 ppm) of MISON gases is enough to effectively reduce the amountozone formed in the welding process. The small amounts of Nitrogen dioxproduced in the enhanced welding process are a result of ozone reductand are acceptable. The addition of NO to shielding gases does not affthe mechanical properties or the corrosion resistance of welds. In fact, opposite is true. In TIG and MIG welding, the NO content in the shieldgas produces a more stable arc and makes it easier to control the weldprocess. And since the stability of an arc always decreases with an increasamount of Helium in the Argon shielding gas, adding NO stabilizes the

making positional welding easier.

With MISON® shielding gases productivity and a good working environment go hand in han

MISON is a complete range of Linde shielding gases designed to improve the quality and productivity of almost awelding application. Due to their capacity to reduce the level of ozone in a welding area, MISON shielding gases provian excellent foundation for other efforts to improve the working environment of welders.

More on welding and a welder’s healthAll welding generates hazardous pollutants in the form of fumes and gases. Their amounts produced depend on various factors, such as the weldinmethod, the material welded, filler metal, welding parameters and the shielding gas used. Fume particles consist of metal oxides. These are formed whethe melted metal is vaporized in the arc and then condenses and oxidizes upon contact with the surrounding air. The most hazardous fumes are considereto consist of Nickel and chromium compounds that are formed during the welding of stainless steel. Ozone is one of the most hazardous and harmful gaseformed 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 ilikely to be. Other gaseous impurities resulting from the extremely high temperatures and ultraviolet radiation emitted by the arc are Carbon monoxide (COand 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 gasesthat rise from the welding spot. The highest ozone concentrations are generated in the MIG welding of Aluminium. Ozone concentration in the plume is verhigh (4-10 ppm) as it also is in the TIG and MIG/MAG welding of stainless steels and the MAG welding of ”black“ steel.

2

100 200 300

0

1

2

3

4

MISON® shielding gas

Short ArcMixed arc

Spray arc

Standard Shielding gas

Mison reduces ozone formation in most types of welding.

Mison attacks when and where ozone is formed. The nitric oxide contentof mison gases reacts with the ozone formed by the UV radiation emittedby the arc to form oxygen and nitrogen dioxide. The result is a significantlylower content of ozone pollutants in the welder‘s immediate area.

Ozoneconcentration Symptom

0,05 Ozone can be smelled TLV8h /ppm (2002) = 0.05 ppm

01 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

Ozoneconcentration Symptom

ozone O3 0.05

Nitrogen dioxide NO2 3

Nitric oxide NO 25

Carbon monoxide CO 30

Carbon dioxide CO2 5000

TLVS of gaseous air pollutants formed during welding, ministry of labour, 2002.Typical symptoms of ozone concentrations.



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 conditionThe addition of Nitric oxide into the shielding gas does not affect the mechanical properties or corrosion resistance welds. In TIG and MIG welding, the NO content in the shielding gas provides a more stable arc and makes it easier

control the welding process.

MISON® Ar (Ar + 0.03% NO)An all-round choice for TIG welding that provides an easy-to-strike and stablearc. For the MIG welding of Aluminium, high-alloy stainless steels and Copperand Nickel alloys. Stable process without spatter. Very good for the MIGbrazing 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 metal-cored wires. It’s mainly intended for spray arc and pulsed arc. Provides highwelding speed, little spatter and surface slag, low weld reinforcement andefficient electrode consumption. It’s the best choice for high-productivitywelding 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)For the MAG welding of unalloyed and low-allow steel with solid andfluxcored wires. Suitable, with certain exceptions, for pulsed welding andfor 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 gasfor a wide variety of applications.

Shielding gases EN 439-S M21 + 0.03 NO, group M21

MISON® 25C (Ar + 25% CO2 + 0.03% NO)For the MAG welding of unalloyed and low-alloy steel with solid andfluxcored wires and for the welding of stainless steel with rutile flux-coredwires. Good fluidity of the weld pool in short-arc welding. Excellent resistanto impurities in spray-arc welding. Especially preferred in short-arc and sprarc 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 othe weld pool, better penetration, higher welding speed and a lower need 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 MISONAr. Suitable for being mixed (in a mixer) with Carbon dioxide and/or Heliumto form various mixtures. It makes it possible for those using liquid gas tobenefit from the improvements provided by MISON shielding gases in theirworking environments.Shielding gases EN 439-S I1 + 0.03 NO, group I1

Recommended

Alternative. May in some casesbe advantageous.

Unalloyed/low alloyed steelStainless steel, Austenitic

Stainless steel, Duplex

Aluminium and alloys

Copper and alloys

Titanium

M I S O N ® A

r

M I S O N ® 8

C

M I S O N ® H

e 3 0

M I S O N ® 2

C

M I S O N ® 1

5 C

M I S O N ® 2

5 C

T I G

Unalloyed/low alloyed steel

Stainless steel, Austenitic

Stainless steel, Duplex

Aluminium and alloys

Copper and alloys M I G / M A G



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MISON 8C Shielding Gas Family135 99115