True to their promise of outstanding customer service and a safe provide of merchandise, Air Products has turn into a trusted companion to their prospects and plays an integral function in ensuring that their manufacturing processes are environment friendly, cost-effective and delivers a quality finish product. These strong relationships have been formed as the results of a mix of unsurpassed expert and knowledgeable technical experience from the Air Products staff. The team at all times strives to supply prospects with sound recommendation on probably the most appropriate products from Air Products’ intensive vary, to maximise their output.
According to Air Products, they have managed to place themselves as a market leader as they place an emphasis on the customer’s needs. Firstly, they goal to make certain that they have the product and the capacity to provide product based on the customer’s wants and assist in preventing disruptions and unnecessary down time. Secondly, they be positive that the purchasers use the correct gasoline for his or her purposes as this reduces post-weld activities and cleansing up. Their guidance is critical to prospects, as these modifications eradicates accumulated costs which would possibly be typically not anticipated.
Sean Young, Air Products Welding Specialist
Back to the drawing board with Sean Young
Sean Young emphasizes the significance of defending a molten weld pool from atmospheric contamination and oxidation, either by a flux or with a protect gasoline. A flux is used in shielded metallic arc (SMA) electrodes or submerged arc processes. Shielding gases, however, are used in gasoline metal arc welding (GMAW), gas tungsten arc welding (GTAW) and a lot of the flux-cored processes.
Reviewing the precise standards associated to a customer’s processes and providing guidance is crucial. An evaluation of the process, material and its thickness, and the preferred metal transfer should be performed. Furthermore, to optimize the selection and supreme quality of the weld, the porosity, spatter, penetration, bead profile and fusion ought to be thought-about.
The function and advantages of protecting gases
The most frequently used mixtures and shielding gases with respective applications are:
Ar: used for many GTAW application and GMAW of non-ferrous materials
CO₂: used principally for GMAW in dip transfer mode of steels
Ar/CO₂, Ar/O₂ and Ar/CO₂/O₂ fuel combination: used for GMAW of stainless-steel and different steels
Ar/He and Ar/H₂ mixtures: used for advanced GTAW applications
Ar/He/CO₂ and Ar/H₂/CO₂ mixtures: used for GMAW
Argon and carbon dioxide both play a core shielding role in GMAW applications as they protect the weld metal from atmospheric oxygen or other contamination.
Young explains the distinction between pure oxygen and argon within the welding course of. “Pure CO₂, which is the unique shielding gasoline for GMAW, is broadly used for common purpose welding of steel and is an efficient shielding gas that forestalls porosity. Due to its inclination to trigger giant droplet formation, it is restricted in its use in the dip-transfer mode. เครื่องมือที่ใช้วัดความดันโลหิต by itself causes massive volumes of spatter which reduces the effectivity and arc time of the welder and increases the welder’s publish weld activities”.
Young further explains: “Argon, however, is mostly the dominant gas in any shielding gas combination cylinder. In its pure form, argon is an inert gas which is solely used to maintain other gases out and has no chemical impact on the deposited weld steel. Argon is used in virtually all GTA welding in addition to for GMAW of aluminium alloys copper, its alloys and different oxygen sensitive material”.
The value of adding energetic gases
Adding small quantities of defending gases may obtain improved welding results, which implies that the steel transfer is secure, there may be lowered spatter and a soft arc. According to Young, an improved transfer stability makes the welding process much less delicate to welding parameters and more tolerant to voltage and current variations. This ultimately results in a vast reduction in machine set-up time and a noticeable improvement in the overall productiveness.
“It is important to note that when welding with cored wires, and the oxygen content material is too excessive, there may be an increased risk 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 perfect for chrome steel purposes.
To improve the penetration of carbon metal joints, CO₂ must be added to the argon in a two-part mix. Young feedback that an increase in CO₂ will increase the heat of the welding arc, will increase penetration and increases the welding speed. He cautions that 20% CO₂ in argon should not be exceeded, because it causes spatter and instability. “It is essential to notice 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 confirmed advantages
It is necessary to know that a mixture of shielding gases plays a role in offering the most effective weld properties for explicit purposes. Young explains that three-part mixtures consist of argon and CO₂ (maximum 15%) and O₂ (maximum 3%). In an instance where all three of these gases are used, arc stability is improved, penetration and bead profiles are improved, minimum spatter is generated, and metallic switch characteristics are optimised.
One thing that Young is assured about is that there are definite advantages to utilizing three-part mixture, based on his experience with many customers in the industry through the years.
“The three-part mixtures are extremely easy to use, and the welding stability permits for extra variations in setting parameters. We have seen how using these gases have elevated the standard, productiveness and efficiency, and finally, measurable increases in profitability. Welding stability is extraordinarily important because it has a direct impression on the total welding costs – it’s fascinating to see how small improvements could make a giant difference”.
Young concludes: “At Air Products, we try to turn into and remain a trusted partner to every certainly one of our clients by providing them with the best solutions for their business, primarily based on our data and technical expertise. Our approach is easy: We determine probably the most suitable gases for a customer’s processes –thereafter the shopper focuses on the effectivity of their processes whereas we focus on a safe product supply as per their particular requirements.

Scroll to Top