Welding companies with high gas consumptions are increasingly giving more responsibility to gas suppliers entrusting them with gas management.

Gas suppliers are being asked to check the quantities in stock and cylinder bundles or tanks set up at the individual companies depending on the consumption. The gas type is also being extensively managed using individual agreements.

When companies have diverse application needs, appliances are offered for mixing the gas which ensures they don’t have to buy pre-mixed shielding or process gases. Operations can also be changed over to different gas mixtures within a short period of time.

Welding gases are those which are used or produced during welding and cutting processes like shielding gases or gases which are produced by the decomposition of fluxes, from the interaction of ultraviolet light or high temperatures with gases or vapours in the air.

Many different types of gases are used in welding processes – it's the welding method and also the product being welded which dictates the choice of gas mixture.

When arc welding is being carried out, especially on stainless steels, the choice of shielding gas is particularly important – a mix of argon, helium and carbon dioxide exerts an influence on the penetration and weld appearance. The welding speed can be increased by 35 to 40 per cent while also reducing temper colours.

Generally for wire, the gas which is most commonly used is Hydro Secure 18 – argon with 18 per cent carbon dioxide - argon is the most commonly chosen for TIG welding.

When combined with either hydrogen, helium or oxygen, argon is used to improve welding characteristics on many materials. However, for MIG / MAG welding of rustproof materials, gases with a low CO2 content – typically around two per cent - are used along with argon.

For autogenous welding, acetylene and oxygen are used and purging gas, such as argon or nitrogen, is used to maintain good corrosion resistance for welding rustproof pipes and containers.

At the four-yearly Essen Welding Show next month, some of the biggest names in the industry involved in welding gases will be taking part with almost 70,000 trade buyers expected to visit.

For further information:
Essen Welding Fair
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