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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.
Tips and Techniques for Taking a Mig Welding Certification Test. When mig welding tests are given using bare wire short circuit mig welding, the test is often done using 3/8â A36 structural plate. A 37.5 degree bevel is used for an included angle of 75. A 1/8â root opening with a 0-1/16â land is also common. (the land is a flat area filed or ground on the sharp point of the beveled test plate). If an all position welding certification is needed then a 3G (vertical) and 4G (overhead) tests are both required.