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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.
Always use the right technique for the type of weld you are doing. Not every technique is right for everyone and not technique works on every joint in any position. Nothing works all of the time and it comes down to what works right for you. Weld techniques are the smallest factor in MIG welding!Finally the GOLDEN RULE of MIG welding Techniques ! If you want a sound quality weld that looks good, you need to be comfortable and take you sweet time.othing works all of the time and it comes down to what works right for you. Weld techniques are the smallest factor in MIG welding! Finally the GOLDEN RULE of MIG welding Techniques ! If you want a sound quality weld that looks good, you need to be comfortable and take you sweet time.