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  • ALCOA035
    replied to Precleaning Aluminum
    Oh, the humanity........

    I've been welding aluminum sheet, plate, ingots and conduit for over 28 years.
    Cleaning whether it be sheet or plate is done via a dipping process. 1) Caustic for any where from 30 sec to 4 mins. 2) COLD water rinse. 3) NITRIC dip for 30 sec to 4 min to...
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  • ALCOA035
    replied to 75% Helium 25% Argon mix?
    Argon/Air mix

    I've been welding aluminum for over 28 years and the mix usually sets at 80/20 for some items. 92/8 for more critical jobs.
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