![]() While some machines are limited to gas or gasless only, at UNIMIG, all of our MIG welders are capable of both processes. If you are using gasless wire, then the polarity is switched the polarity cable would go into the Negative (–) and the earth clamp into the Positive (+). This means that you need to insert the polarity cable into the Positive (+) panel mount and the earth clamp (which comes provided) into the Negative (–) panel mount. Gas welding with aluminium, stainless steel, and mild steel all require an electrode positive polarity. The polarities will also require different setups depending on whether you have chosen gas or gasless welding. If you’re shielding gas is being blown away, then the weld will be prone to defects like porosity (the Swiss cheese look). If you’re welding outdoors with gas, you’ll find you may need to turn up the gas flow or set up a cover, as the breeze can affect how much gas is reaching the weld pool. UNIMIG recommends an 8-12L per minute gas flow rate for all MIG welding, and these recommended settings can be found on the guide table inside each machine. Twist the regulator valve to set how much gas flow you want for the weld. One shows how much gas is still in the tank, and the second shows your gas flow rate. Every UNIMIG machine (except the Viper 120) comes with a gas regulator, so don’t worry about having to buy your own. ![]() When you’re using gas, all you need to do is attach the regulator to the tank, attach the gas hose from the welding machine to the regulator and set your gas flow. If you’re welding with aluminium, then you’ll need pure argon for your shielding gas. You can also add a small amount of oxygen to the ArCO2 mix. The best gas to use for mild steel and stainless steel is a mixture of argon and carbon dioxide (75% Ar/25% CO2) however, straight carbon dioxide works as well. If you’re using a shielding gas for your weld, there are a few to choose from, as different metals require different shields. The second is gasless, and the filler metal used has a flux core, which protects the weld instead of gas. The gas is used to shield the weld metal from any outside contaminants when welding. This is why MIG welding is considered one of the easiest types of welding to learn and a great place to start for beginners. The process of MIG welding is semi-automatic, as the machine does all the wire feeding for you. Metal Inert Gas (MIG) welding is an arc welding process in which a solid wire (the filler metal) is continuously fed through the welding machine and into the weld pool that’s created by the arc to form a weld.
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