any Lincoln welder i have had all had a plastic liner. But anyway If you going to mig weld alum. You really should have a spool gun. Most all other mig welders The Leads are to LONG and this is the issue because it is hard to PUSH alum wire that far.Esp.if the Lead is not 100% straight,even if you tip angle the gun(to far) It can cause the wire to get stuck.
So If you really want to weld Alum, Either Spool
it OR Tig it.These will give you the Best Looking and much stronger Welds.
God doesn't like ugly.
