What type of mig welding wire do I need to use?
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I have a little experience in welding (2 year certificate and some work experience) and I have mainly welding structural steel. Just recently I started working with aluminum and sheet metal. I know there is mild steel and aluminum welding wire on the market in different thicknesses, etc. Apparently last week, I used mild steel wire on aluminum and it still produced good welds and beads. My question is, when I'm welding aluminum, I have to use the aluminum mig wire and when welding structural I need to use the mild steel wire correct?