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  1. #1
    Join Date
    Feb 2007
    Blissfield, MI

    Default Cast aluminum filler?

    I have a piece of cast aluminum to weld. Can I use 5356??? If not, which type??
    Thanks, Shane

  2. #2
    Join Date
    Feb 2007
    Central illinois

    Thumbs up cast aluminum

    the last time i welded cast alum. it was a tranmisson. and i used er4043 and it seemed to work ok. it is still holding today
    miller bobcat 250
    wc 115a
    spoolmatic 30a
    centery 250 mic
    2 lincoln 225 stick
    a 1954 hobart portable welder w/ willies jeep engine

  3. #3
    Join Date
    Jun 2006
    Calgary, Alberta


    You can use either 5356 or 4043. The 4043 may match the casting color better than the 5356, and is also heat treatable if that is a concern. 5356 will produce a stronger weld, however the base metal will most likely be lesser in strength, so there probably wont be any advantage to welding with the 5356.

    Dynasty 300DX
    Esab PCM 1000

  4. #4
    Join Date
    Jan 2007
    Delmont, PA

    Default Casting prep....

    Hey swyman,
    I do agree with JonnyTIG regarding filler. 4043 is a bit more forgiving, but 5356 is stronger. I use 5356 95% of the time with the MIG process and 4043 on occasion. Take into consideration, if the casting is over 1/4" thick, much better results will be had by preheating the casting to 250-300 deg.. And the most important factor for a sound weld is the cleanliness of the aluminum. Aluminum is very finicky if there is any kind of contamination on the metal. Wire brushing with a SS brush and acetone vigorously will generally get the metal clean for a good weld joint. Hope that helps a bit.....Denny

  5. #5
    Join Date
    Mar 2006
    Ocean City, Maryland


    I use 4043 alot [tig] on cast aluminum. Seems to work fine. i have repaired some of the coolest antique toy tractors with this rod, grant it strength is not a big issue, but it seems to weld good. Also repaired several transmission covers/cases also and seems to work good
    HMW [Heavy Metal welding]

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