Aluma pro contact tips sticking

[1Redneck]

I'm sure this has been discussed before, but it can be like finding a needle in a haystack searching for some things.....so, sorry if this is redundant.

First of all, we're new to aluminum welding. We have a big project welding aluminum parts and are having problems with the wire melting...

[MAFoElffen]

I have questions about when to use contact tip setback (tip-to-nozzle)... or when someone would someone want to use a different styles of tips from the standard style (such as Cutback tips, Heavy Duty tips or Tapered tips)? I know the tips for my spool gun have a cutback in the face of the tip and...