Therefore , you want to setup up your MIG welder for aluminum welding. One of the first things will need to change is the type of gas on your machine. When the metal being welded is aluminum, the only forms of choices are Nobel inert vapors! This means the gasses do not react with the metal or change any of the properties of the metal. The two gasses used are:
Argon is the most commonly used gas in the welded industry. It is typically used in a mixture for cost savings. However , when MIG welding aluminum, it must be 100% pure Argon. If you have any other gasses combined in there, it will produce porosity in the weld and when you are welding you will see that the weld puddle has a fizzle to it. Kind of like a sparkler burning up. Argon gas is used on most aluminum thicknesses and works well in all positions.
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The transfer type it creates is a spray transfer. When it comes to squirt transfer most people assume it is correct spray transfer, which produces a hum or a hissing sound. It is almost silent but that is just true if it is being used on thin metals and in the flat placement. This gas, when used away from position and on thicker metals, will need a higher wire feed speed and that will create a fast crackling sound to the weld. Argon gas is the best overall choice for aluminum MIG welded.
Helium is sometimes added to the Argon (ar) gas in a mixture form. This really is done to increase the arc heat range to allow better penetration. Argon by itself works best, but if you are welding thicker material and need a faster creation rate the Argon/ Helium mix may be the way to go.