Welding aluminum IS easy....
It has to be super clean - and you're on A/C ??
If you're having issues --- try brushing it with a fine stainless steel wire brush along the edges you plan to weld. Go slow on the power when you first light it off - sneak into it (not too slowly or it soots up)... Also what tungsten diameter and gauge of aluminum and what grade of aluminum are you trying to weld??
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