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SF_SN888KE,
It is a good idea to get it cleaned before welding. Anytime you are welding aluminum you need to have a good clean surface so the welds do not get contamanated. The weld shop might also ask for it to be acid etched. Any aluminum plating shop could do that.
For another weld shop, you could also try Cal-Weld. I think they are up in the Fremont / Union City area but I am not positive on that.
Also, you said that it is powdercoated. You might want to have the powdercoating removed before welding. and then repaint or powdercoat. I have all of my powdercoating done at MAAS Brothers in Livermore, but there are a lot more just as good, closer to you.
Terry
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