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100 % argon gas is usually the gas of choice but mixtures like 50/50 argon/helium can be helpful for welding thick sections.Make sure the polarity is connected properly. mig welding aluminum requires reverse polarity. Another way of saying reverse polarity is Direct current electrode positive or DCEP.
When comparing MIG welding to flux core arc welding, there is a huge gap in production, in the amount of weld per hour. A MIG welder can typically produce 5 to 8 pounds of weld per hour, verses a FCAW welder packing 25 plus pounds of weld per hour.he voltage type used is D/C direct current like the type current produced by a battery. The polarity used in industrial flux core arc welding is typically D/C electrode (+) positive. This means that the handle is the positive side of the circuit, or the electricity flows from the metal to the welding handle.