I use a similar welder Dave and each one will have its own idiosynchrosies (long word for this time of morning). I use second highest out of 4 with a speed of 6 but then we use 2mm box section for 16 gauge as ginge says 3rd setting should be fine. Practice on a few sections first to get you penetration.
Mine is a great little welder but i'm sick of it overheating on constant use so about to upgrade to a Portamig 185, made in the UK and gets great reviews.
Enjoy.....AndyH
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