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Uncertain how much torch time you have doing aluminum repairs but it's imperative that the region where the weld takes place is clean, as in, medically clean. Not one black spec of grease, sealant, or oxidized aluminum surface. My cleaning time for welding that ear would easily be an hour or more. Even then oil seeping from porosity will have to be cooked out with a torch and then the area recleaned.
I don't envy you having to re-repair that mess.
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