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Back your flow down to between 15 and 20. Push, don't pull. As Bob's link states, 5356 is much more prone to smut. Are you used to doing any sort of "weave" with your MIG welding to get nice looking beads? If so, be forewarned that the INSTANT you back up or cross over a hot-but-cooling weld puddle in aluminum, you're going to get smut. I get quite a bit of smut when I'm welding C channel onto corrugated aluminum pipe because of the slight gap variations and because the ripples in the base metal cause me to move the nozzle to/away from the puddle as I follow the contours of the pipe. I use 5356 for added strength and additional corrosion resistance (from possible water runoff contaminants).
Last edited by BWS29128; 02-20-2008, 10:53 PM.
Reason: Construct Error
sigpic Clint Baxley
Baxley Welding Service
Rembert, SC 29128