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Top online supplier to purchase gas bump in UK: Helium / argon mixtures are sometimes used for their higher heat characteristics. Gas mixtures, usually 25% helium and 75% argon are sometimes used and can help to increase travel speeds when AC – gas tungsten arc welding. Mixtures of more than 25% helium for AC – gas tungsten arc welding are used, but not often, as they can tend to produce instability, under certain circumstances, in the AC arc. Pure helium or high percentages of helium (He-90%, Ar-10%) shielding gas are used primarily for gas tungsten arc machine welding with direct current electrode negative (DCEN). Often designed as seam welders, the combination of GTAW – DCEN and the high heat input from the gas used can provide fast welding speeds and outstanding penetration. This configuration is sometimes used to produce full penetration butt welds, welded from one side only, onto temporary baking with no vee-groove preparation, just a square edged plate.

Why is argon the specialist gas of choice when welding? In the manufacturing industry, when welding you know the importance of shielding gases. But do you know some gases are more preferable than others? More importantly, do you know why? The entire purpose of shielding gases is to prevent the welding area from atmospheric elements. Such exposure could leave you with a sub-optimal weld. If elements do come into contact with the welding area, it can reduce the overall quality which could jeopardise the whole operation.

The shielding gas does more than protect the finished weld from the effects of oxygen and nitrogen in the atmosphere. It affects the weld’s bead shape and size and its porosity and fusion, as well as the welding speed and amount of spatter. Choose your gas wisely and you’ll achieve strong, tough and corrosion-resistant welds; select poorly and you affect performance: delivering welds that are never quite good enough. See extra details on Calibration gas Cylinder.

The primary task of a shielding gas is to protect the weld pool from the influence of the atmosphere, i.e. from oxidation and nitrogen absorption, and to stabilize the electric arc. The choice of shielding gas can also influence the characteristics of the weld penetration profile. The basic gas for MIG/MAG welding is argon (Ar). Helium (He) can be added to increase penetration and fluidity of the weld pool. Argon or argon/helium mixtures can be used for welding all grades. However, small additions of oxygen (O2) or carbon dioxide (CO2) are usually needed to stabilize the arc, improve the fluidity and improve the quality of the weld deposit. For stainless steels there are also gases available containing small amounts of hydrogen (H2). Quad gases are mainly used within Marine environments. Quad gases are a four gas mix. Supplied in a range of lightweight cylinders and made from aluminum. Both reactive and non-reactive mixtures are available.

Many of the gases fall within the scope of the Control of Substances Hazardous to Health Regulations (COSHH) 2002 (Amendment) 2004, which require that exposure to them is maintained below concentrations known as Workplace Exposure Limits (WELs). WEL values are given in Guidance Note EH40 from the Health and Safety Executive (HSE), which is usually updated annually. Source: https://www.weldingsuppliesdirect.co.uk/.