I'm a mug welder...
Latest task is to weld 2mm thick 24mm OD gal pipe onto 4mm thick 36mm OD gal pipe.
The job is laying flat on the bench. It's legs and crosspieces for a table.
Do I go 130A (my welder's max - they say for 3.2mm, that's the theoretical max I can weld I suppose, but the job's gotta be done with it) for the 4mm or 55A for the 2mm or something in between?
And use what technique? Run a bead or tack weld? Bead on the thick pipe and flow onto the thin? Or bead on the thin, flow onto the thick? Or bead on both at once?
I am, of course, trying to find the way myself but with so many variables I just keep getting inconclusive results and probably the best thing to do is just ask someone who knows.