Aluminum needs higher voltage for strong welds, Set Rebel 235 to 24V for better results, Use 100% argon at 25 CFH, My Esab welded better after cleaning, Clean with alcohol, Push wire don’t pull, Check spool gun tension, Use 250 ipm.
patchy welds comes from incorrect settings or prep, Adjust wire speed to 250 ipm for stability, My Esab welds aluminum strong now, Clean metal with acetone.