Hydrogen for welding

Combustible and reducing gas.

Gas with multiple uses in the metal fabrication sector

It can be used as pure or mixed fuel gas, it is widely applied in welding processes mixed in small percentages to argon as protection gas for the TIG/MIG (Tungsten Inert Gas/Metal Inert Gas) process of austenitic and copper steels or in MAG (Metal Active Gas) welding of austenitic steels.

It also finds application in gas mixtures intended for root protection, but it is not compatible in processes with materials such as carbon steel and aluminum.

Also used in plasma welding (always mixed) for the generation of the plasma itself, but also in the plasma cutting process in considerable percentages for cutting austenitic and high-alloy steels for high thicknesses.

-253 °C
First ionization energy relative density
Close to absolute "zero”.
1,3120 J/mol
First ionization energy
Low ionization energy, help electric arc starting.
Relative density
High volatility.
Related Gases
Acetylene for welding
Extremely unstable combustible gas under normal conditions. It is treated in special cylinders stabilised with a solvent: usually acetone. It generates a high flame temperature and remains the most productive fuel gas in this type of process.
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Argon for welding
Inert gas, 1.38 times heavier than air. It has a low ionisation potential which facilitates the ignition and re-ignition of the arc, giving it a high stability, generating few fumes. Its low thermal input promotes conical penetration. Being heavier than air, it offers good air displacement. It is used as a base for welding mixtures.
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Carbon Dioxide for welding
Oxidising gas 1.53 times denser than air, providing good protection. It has a low ionisation potential, which is why it began to be used in the MAG (Metal Active Gas) process. It generates energetic arcs due to dissociation and recombination but not very stable and not very fluid baths with a high rate of projections and fumes giving nut-like penetrations.
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