Originally Posted by 16v4nrbrgr
If you get the MIG amps set right and the feed rate set, you can watch the puddle and tell whether the weld penetrated well while laying it down.
I concure. Watch the puddle. If you need a magnifier lens in your hood, get one, or place a bright light on your work. You shouldn't have to guess if you're getting penetration; you should be able to see it.