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@user124345
Heres a tip get a footpedal
for steel for every thousands of thickness use 1 amp so 1mm thick is 35 to 40 amps
If pulse welding you will need to miltiply by 2.5-2.7 as a start point so for 0.9 mm steel amps will be about 75-90 depending how fast your moving
2-4k pulse? Pulse you probably want somewhere between 30 to 90 as experience and speed allows