It is important to understand the criteria for gas specifications applied with ISO14175:2008 classification and designations to ensure compliance with customer needs and Weld Procedure Specifications as shown in the table below:
Symbol | Components in nominal percentage of volume | ||||||
---|---|---|---|---|---|---|---|
Main group | Sub-group | Oxidizing | Inert | Reducing | Low reactivity | ||
CO2 | O2 | Ar | He | H2 | N2 | ||
1 | 1 | 100 | |||||
2 | 100 | ||||||
3 | balance | 0,5 ≤ He ≤ 5 | |||||
M1 | 1 | 0,5 ≤ CO2 ≤ 5 | balance* | ||||
2 | 0,5 ≤ CO2 ≤ 5 | balance* | |||||
3 | 0,5 ≤ O2 ≤ 3 | balance* | |||||
4 | 0,5 ≤ CO2 ≤ 5 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
M2 | 0 | 0,5 < CO2 ≤ 15 | balance* | ||||
1 | 15 < CO2 ≤ 25 | balance* | |||||
2 | 3 < O2 ≤ 10 | balance* | |||||
3 | 0,5 ≤ CO2 ≤ 5 | 3 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
5 | 5 < CO2 ≤ 15 | 3 < O2 ≤ 10 | balance* | ||||
6 | 15 < CO2 ≤ 25 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
7 | 15 < CO2 ≤ 25 | 3 < O2 ≤ 10 | balance* | ||||
M3 | 1 | 25 < CO2 ≤ 50 | balance* | ||||
2 | 10 < O2 ≤ 15 | balance* | |||||
3 | 25 < CO2 ≤ 50 | 2 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 10 < O2 ≤ 15 | balance* | ||||
5 | 25 < CO2 ≤ 50 | 10 < O2 ≤ 15 | balance* | ||||
C | 1 | 100 | |||||
2 | balance | 0,5 ≤ O2 ≤ 30 | |||||
R | 1 | balance* | 0,5 ≤ H2 ≤ 15 | ||||
2 | balance* | 15 ≤ H2 ≤ 50 | |||||
N | 1 | 100 | |||||
2 | balance* | 0,5 ≤ N2 ≤ 5 | |||||
3 | balance* | 5 < N2 ≤ 50 | |||||
4 | balance* | 0,5 ≤ H2 ≤ 10 | 0,5 ≤ N2 ≤ 15 | ||||
5 | 0,5 ≤ H2 ≤ 50 | balance | |||||
O | 1 | 100 | |||||
Z | Gas mixtures containing components not listed, or mixtures outside the composition ranges listed.** |
* For the purpose of this classification, Argon may be substituted partially or completely by helium.
** Two gas mixtures with the same Z-classification may not be interchangeable
Some examples using ARCAL™ are here:
ARCAL™ M24
Symbol | Components in nominal percentage of volume | ||||||
---|---|---|---|---|---|---|---|
Main group | Sub-group | Oxidizing | Inert | Reducing | Low reactivity | ||
CO2 | O2 | Ar | He | H2 | N2 | ||
1 | 1 | 100 | |||||
2 | 100 | ||||||
3 | balance | 0,5 ≤ He ≤ 5 | |||||
M1 | 1 | 0,5 ≤ CO2 ≤ 5 | balance* | ||||
2 | 0,5 ≤ CO2 ≤ 5 | balance* | |||||
3 | 0,5 ≤ O2 ≤ 3 | balance* | |||||
4 | 0,5 ≤ CO2 ≤ 5 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
M2 | 0 | 0,5 < CO2 ≤ 15 | balance* | ||||
1 | 15 < CO2 ≤ 25 | balance* | |||||
2 | 3 < O2 ≤ 10 | balance* | |||||
3 | 0,5 ≤ CO2 ≤ 5 | 3 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
5 | 5 < CO2 ≤ 15 | 3 < O2 ≤ 10 | balance* | ||||
6 | 15 < CO2 ≤ 25 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
7 | 15 < CO2 ≤ 25 | 3 < O2 ≤ 10 | balance* | ||||
M3 | 1 | 25 < CO2 ≤ 50 | balance* | ||||
2 | 10 < O2 ≤ 15 | balance* | |||||
3 | 25 < CO2 ≤ 50 | 2 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 10 < O2 ≤ 15 | balance* | ||||
5 | 25 < CO2 ≤ 50 | 10 < O2 ≤ 15 | balance* | ||||
C | 1 | 100 | |||||
2 | balance | 0,5 ≤ O2 ≤ 30 | |||||
R | 1 | balance* | 0,5 ≤ H2 ≤ 15 | ||||
2 | balance* | 15 ≤ H2 ≤ 50 | |||||
N | 1 | 100 | |||||
2 | balance* | 0,5 ≤ N2 ≤ 5 | |||||
3 | balance* | 5 < N2 ≤ 50 | |||||
4 | balance* | 0,5 ≤ H2 ≤ 10 | 0,5 ≤ N2 ≤ 15 | ||||
5 | 0,5 ≤ H2 ≤ 50 | balance | |||||
O | 1 | 100 | |||||
Z | Gas mixtures containing components not listed, or mixtures outside the composition ranges listed.** |
ARCAL™ Prime
Symbol | Components in nominal percentage of volume | ||||||
---|---|---|---|---|---|---|---|
Main group | Sub-group | Oxidizing | Inert | Reducing | Low reactivity | ||
CO2 | O2 | Ar | He | H2 | N2 | ||
1 | 1 | 100 | |||||
2 | 100 | ||||||
3 | balance | 0,5 ≤ He ≤ 5 | |||||
M1 | 1 | 0,5 ≤ CO2 ≤ 5 | balance* | ||||
2 | 0,5 ≤ CO2 ≤ 5 | balance* | |||||
3 | 0,5 ≤ O2 ≤ 3 | balance* | |||||
4 | 0,5 ≤ CO2 ≤ 5 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
M2 | 0 | 0,5 < CO2 ≤ 15 | balance* | ||||
1 | 15 < CO2 ≤ 25 | balance* | |||||
2 | 3 < O2 ≤ 10 | balance* | |||||
3 | 0,5 ≤ CO2 ≤ 5 | 3 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
5 | 5 < CO2 ≤ 15 | 3 < O2 ≤ 10 | balance* | ||||
6 | 15 < CO2 ≤ 25 | 0,5 ≤ O2 ≤ 3 | balance* | ||||
7 | 15 < CO2 ≤ 25 | 3 < O2 ≤ 10 | balance* | ||||
M3 | 1 | 25 < CO2 ≤ 50 | balance* | ||||
2 | 10 < O2 ≤ 15 | balance* | |||||
3 | 25 < CO2 ≤ 50 | 2 < O2 ≤ 10 | balance* | ||||
4 | 5 < CO2 ≤ 15 | 10 < O2 ≤ 15 | balance* | ||||
5 | 25 < CO2 ≤ 50 | 10 < O2 ≤ 15 | balance* | ||||
C | 1 | 100 | |||||
2 | balance | 0,5 ≤ O2 ≤ 30 | |||||
R | 1 | balance* | 0,5 ≤ H2 ≤ 15 | ||||
2 | balance* | 15 ≤ H2 ≤ 50 | |||||
N | 1 | 100 | |||||
2 | balance* | 0,5 ≤ N2 ≤ 5 | |||||
3 | balance* | 5 < N2 ≤ 50 | |||||
4 | balance* | 0,5 ≤ H2 ≤ 10 | 0,5 ≤ N2 ≤ 15 | ||||
5 | 0,5 ≤ H2 ≤ 50 | balance | |||||
O | 1 | 100 | |||||
Z | Gas mixtures containing components not listed, or mixtures outside the composition ranges listed.** |
Welding gas selector guide

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ISO14175 compliant welding gases
Frequently Asked Questions:
How to choose which gas to use in MIG or MAG?
What is the difference between the MIG and MAG welding processes?
What is the difference between brazing and welding?
How to adjust the gas flow when welding?