Tungsten swapping made a difference not as much as post flow increase through, argon flow dropped to 8 lpm no changes noticed other than gas savings.Switch to 2.4mm tungsten.
Standard 5 cup.
Looks like you’ve got too much stickout causing the tungsten to discolour. Bring the tungsten in and lower argon flow. 10lpm is high for aluminium.
Set to 70/30% welding ok now thanksthat's all about AC ballance
Yeah you always need enough post flow to keep that tungsten shinynot as much as post flow increase through,