How Do You Mig Weld Aluminum?
• Select more powerful welding machines for thicker metal. A 115-volt welder can handle aluminum up to an eighth of an inch thick (3 mm) with adequate preheating, and a 230-volt machine can weld aluminum that’s up to a quarter of an inch thick (6 mm). Consider a machine with an output greater than 200 amps if you will be welding aluminum daily. • Choose the correct shielding gas. Aluminum requires a shielding gas of pure argon in contrast with steel, which typically uses a blend of argon and carbon dioxide (CO2). This should not require any new hoses, although you may need to replace regulators that were designed specifically for CO2. Use aluminum electrodes. Electrode thickness is especially critical with aluminum and there is an extremely narrow range to consider. Thinner wire is more difficult to feed, while thicker wire requires greater current to melt. The electrodes for welding aluminum should be 35,000ths of an inch in diameter (less than 1 mm). One of the best choices is 4043 a
