True to their promise of outstanding customer support and a safe provide of merchandise, Air Products has turn into a trusted companion to their clients and performs an integral function in making certain that their manufacturing processes are environment friendly, cost-effective and delivers a high quality end product. These solid relationships have been fashioned as the end result of a mixture of unsurpassed expert and knowledgeable technical experience from the Air Products group. The team all the time strives to provide clients with sound recommendation on essentially the most suitable merchandise from Air Products’ intensive vary, to maximise their output.
According to Air Products, they’ve managed to place themselves as a market leader as they place an emphasis on the customer’s wants. Firstly, they purpose to ensure that they have the product and the capability to supply product in accordance with the customer’s wants and assist in preventing disruptions and pointless down time. Secondly, they be sure that the purchasers use the correct gas for his or her purposes as this reduces post-weld activities and cleaning up. Their steering is crucial to customers, as these modifications eradicates accrued costs that are often not anticipated.
Sean Young, Air Products Welding Specialist
Back to the drawing board with Sean Young
Sean Young emphasizes the importance of protecting a molten weld pool from atmospheric contamination and oxidation, both by a flux or with a defend gas. A flux is utilized in shielded metal arc (SMA) electrodes or submerged arc processes. Shielding gases, however, are utilized in gas metallic arc welding (GMAW), gasoline tungsten arc welding (GTAW) and many of the flux-cored processes.
Reviewing the particular standards related to a customer’s processes and offering steerage is essential. An evaluation of the process, materials and its thickness, and the popular steel switch must be performed. Furthermore, to optimize the selection and supreme quality of the weld, the porosity, spatter, penetration, bead profile and fusion should be considered.
The role and benefits of protecting gases
The most incessantly used mixtures and shielding gases with respective applications are:
Ar: used for most GTAW application and GMAW of non-ferrous materials
CO₂: used principally for GMAW in dip switch mode of steels
Ar/CO₂, Ar/O₂ and Ar/CO₂/O₂ gas combination: used for GMAW of stainless steel and other steels
Ar/He and Ar/H₂ mixtures: used for superior GTAW purposes
Ar/He/CO₂ and Ar/H₂/CO₂ mixtures: used for GMAW
Argon and carbon dioxide each play a core shielding function in GMAW functions as they shield the weld metallic from atmospheric oxygen or other contamination.
Young explains the distinction between pure oxygen and argon in the welding process. “Pure CO₂, which is the original shielding gasoline for GMAW, is broadly used for general function welding of steel and is an efficient shielding fuel that forestalls porosity. Due to its inclination to trigger large droplet formation, it’s restricted in its use within the dip-transfer mode. This shielding gasoline by itself causes massive volumes of spatter which reduces the efficiency and arc time of the welder and increases the welder’s post weld activities”.
Young further explains: “Argon, on the opposite hand, is usually the dominant gasoline in any shielding gasoline mixture cylinder. In its pure form, argon is an inert fuel which is only used to keep other gases out and has no chemical impact on the deposited weld metallic. Argon is used in almost all GTA welding in addition to for GMAW of aluminium alloys copper, its alloys and other oxygen delicate material”.
Private of adding active gases
Adding small quantities of shielding gases might achieve improved welding outcomes, which signifies that the metal switch is secure, there may be reduced spatter and a soft arc. According to Young, an improved transfer stability makes the welding process less delicate to welding parameters and extra tolerant to voltage and present variations. This in the end leads to an enormous discount in machine set-up time and a noticeable enchancment within the total productiveness.
“It is necessary to notice that when welding with cored wires, and the oxygen content is merely too excessive, there’s an elevated danger for porosities as the additional oxygen the flux”, says Young. He explains that argon/oxygen mixtures with oxygen of as a lot as 2% are ideal for stainless-steel applications.
To enhance the penetration of carbon steel joints, CO₂ ought to be added to the argon in a two-part combine. Young comments that a rise in CO₂ will increase the heat of the welding arc, increases penetration and will increase the welding pace. He cautions that 20% CO₂ in argon shouldn’t be exceeded, because it causes spatter and instability. “It is necessary to note that 15% is optimal, and in the case of thinner materials the place you don’t want penetration, 5% CO₂ is sufficient”.
Three-part mixtures– the proven benefits
It is important to know that a mixture of protecting gases plays a job in providing the most effective weld properties for explicit applications. Young explains that three-part mixtures encompass argon and CO₂ (maximum 15%) and O₂ (maximum 3%). In an instance the place all three of those gases are used, arc stability is improved, penetration and bead profiles are improved, minimum spatter is generated, and steel switch characteristics are optimised.
One thing that Young is confident about is that there are definite advantages to utilizing three-part combination, based mostly on his expertise with many purchasers in the trade over the years.
“The three-part mixtures are extraordinarily simple to use, and the welding stability allows for more variations in setting parameters. We have seen how the use of these gases have increased the quality, productivity and effectivity, and in the end, measurable will increase in profitability. Welding stability is extremely important because it has a direct impression on the total welding costs – it is interesting to see how small improvements could make an enormous difference”.
Young concludes: “At Air Products, we attempt to turn out to be and remain a trusted associate to each one of our prospects by offering them with the best options for their enterprise, primarily based on our information and technical experience. Our approach is easy: We determine probably the most suitable gases for a customer’s processes –thereafter the shopper focuses on the efficiency of their processes while we concentrate on a secure product supply as per their particular necessities.

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