Welding woes...frustrating!!

Practice using the same metal thickness, in the same orientation to get the settings correct. If the voltage is all the way up, slow the wire feed a little. You should hear a hissing sound and NO POPPING.

My guess is the angle is thicker than the railm so concentrate the wire on the angle and drag/loop it to the frame rail. Sort of like writing a cursive "e".

If it's a 90 amp welder, it's not really up to snuff to do 1/8" Typically need 1 amp per .001 of material.