MIG welding

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Welding Gas, Pure Argon v Argon Mixtures

Argon Welding Gas Argon gas is commonly used in joining metals together or welding. The purpose of including Argon is to protect and shield the welded area from air, Oxygen and moisture. When any or all of these elements get into the welded area it will oxidise and thus weaken the join. Argon is used because it is firstly inert, or non-reactive so it does not affect the welding process. Other gases that are inert, but that are not as effective as Argon include CO2 and Nitrogen. Nitrogen is reactive at higher pressures and CO2 is used in mixtures with Argon. Secondly, Argon is more commonly used today as it is cheaper than other non-reactive noble gases, such as helium. There are a few types of Argon sold for welding applications. Pure Argon is used for applications including stainless steel, Aluminium and TIG welding of plate, tubing and sheet metal. Pure Argon is also suitable for MIG welding of Aluminium. Argon 5/2 is a mixture of 93% pure Argon with 5% Carbon Dioxide and 2% Oxygen. This blend of gas is a common welding mixture in Australia for MIG welding applications. The Argon 5/2 mix has good general properties around minimising weld spatter, good flow (allowing a fluid weld pool) and helps in creating a good welded appearance on your job. This mixture works well with MIG welding for mild steel, stainless steel, low alloy steel and galvanised steel, where the thickness of the steel is up to around 8-9mm. The addition of the Oxygen and Carbon dioxide into the Argon helps to give the arc more stability, but as mentioned earlier, it also allows the The addition of the Oxygen and Carbon dioxide into the Argon helps to give the arc more stability, but as mentioned earlier, it also allows the welder's pool to be more fluid, giving a nice presentation. Over the years we have also made specific welding mixtures for customers which include [...]

Welding made easy with MIG gas

Welding using a metal inert gas (MIG) welder is really not difficult. Using a MIG welder is easy with the right MIG gas. Plenty of MIG gas options MIG welding is a simple, easy and popular welding process that uses electricity and MIG gas to melt and join metal. Luckily, when it comes to picking the right gas to use, there are plenty of options. Why do you need MIG gas? You need MIG gas in order to shield the weld from the air. But it’s not just the case of picking a MIG gas randomly. Basically, you need to make the right choice of MIG gas to: Determine the depth of the weld Determine the characteristics of the welding arc Determine the weld’s mechanical properties. How to get your gas choice right Rent Free Gas can help advise you as to what is the best MIG gas to use in your particular case. Argon can be used for your MIG welding, especially for steel and aluminium, and Argon 5-2 is also great for mild steel welding. Some other common MIG gases are CO2 and Oxygen, with Helium being the least common. Often, these gases will be fixed together, although Argon and carbon dioxide can be used as a pure MIG gas. In many cases, up to three MIG gases can be combined; typically Argon, CO2 and Helium, or Argon, CO2 and O2. Pure CO2 as a MIG gas can produce the deepest penetrating welds, although the welds can also be rough. A MIG gas made up of CO2 and Argon is very popular, although if you are welding stainless steel, the best MIG gas mix is probably mostly Argon and CO2. MIG gas advantages Welding with MIG gas is great, because: Welding a large number of metals and thicknesses is easy The welt bead is good Weld splatter is minimised Welding with MIG gas is easy to learn and master. MIG gas disadvantages Welding with [...]