Aluminum has to be welded in A/C not DCEN (DC electrode negative).... the A/C (alternating current) is used to keep heat out of the electrode and also to aid in cleaning the aluminum as you weld.
I don't know what setting your particular welder has... but you need to check these if you're having the trouble stated!
The Dynasty 200DX has push button settings to change parameters.... but my big MIG welder actually has to have the cables physically changed if I'm changing polarity.
So - check to see that you are welding ALUMINUM in A/C --- and then there should be settings for frequency etc - and these depend on the gauge - amperage - type of weld etc.
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