Gases we use
Since the 70s, welding gases have started an evolution that has accompanied the evolution of welding machines.
Argon for the metal fabrication industry
Argon is one of the most important gases for the metal fabrication industry. It is colorless, odorless, non-flammable and non-toxic, which ensures that the gas can be used on a very large scale. Argon is generally considered to be one of the best shielding agents, being present in the air. In addition, it is a very favorable gas to maintain the stability of the arc.
Carbon Dioxide for the metal fabrication industry
Carbon Dioxide is the active gas par excellence, especially for carbon steel welding. The energy, coming from the electric arc, separates the Carbon Dioxide into Oxygen, the true active gas in the process, and Carbon. The carbon replaces the gas contained in the steel, which is lost in the welding process, leaving the chemical composition of the welded joint unchanged.
Helium for the metal fabrication industry
Like Argon, Helium is an absolutely inert gas that does not react under any circumstances. Thanks to its ionization potential, it transfers more energy, bringing more heat into the welded joint. In addition, the low specific weight of Helium widens the protection cone, which facilitates the cooling of the welded joint.
Hydrogen for the metal fabrication industry
Hydrogen is a combustible and very light gas that has the characteristic of binding easily with Oxygen. For its deoxidizing function and the contribution of energy it can give to the welding process, Hydrogen is used, in small percentages, in the TIG and MAG welding processes.
Nitrogen for the metal fabrication industry
Nitrogen is a gas which, under normal conditions, is considered as inert. When Nitrogen is subjected to extreme conditions, such as a welding process, it can become reactive. Generally, it's used pure or in a mixture as a backing gas.
Oxygen for the metal fabrication industry
Oxygen has proven its value in the MAG welding process of carbon steel by making the welding pool more fluid. As Oxygen is also responsible for the decarburization of the welded joint, it is also used, in small percentages, in mixtures.
Acetylene for the metal fabrication industry
Acetylene is a fuel gas which, combined with Oxygen, generates a very high flame temperature and an atmosphere that can be used in braze-welding and other oxy-fuel technologies. Its instability is resolved by storing it in special cylinders that contain a porous mass that is first saturated with a solvent (Acetone or DMF). The Acetylene is than dissolved in the solvent to make it stable and safe to use.
Do you still have questions?
In Nippon Gases we have developed various qualities of gases to adapt to your applications. Call us or write to us and we will help you get the most out of it.