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Thread: TIG filler for 6061 in oceanside environment

  1. #1
    Join Date
    Mar 2018
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    TIG filler for 6061 in oceanside environment

    I'm making a gooseneck pedestal to hold a keypad outside a driveway gate for a house in Hawaii. The old one was powder-coated steel and rusted through in ~15 years. I'm using 6061, with a 3/4" plate on bottom and 3" schedule 40 pipe for the main structure (3.5" OD, 0.22" wall). There will be some 1/4" stiffening ribs at the connection to the bottom plate and a 1/4" plate at the distal end for mounting the box to hold the keypad.

    I've looked at Hobart's filler selection chart.

    I have both 4943 and 5356. Based on the chart, it looks like 4943 would have better corrosion resistance but lower strength and toughness as compared to 5356. Since the pedestal has to support very low loads, I am inclined to use the 4943 for its corrosion resistance. As I have next to no experience, however, I'd appreciate your input.

  2. #2
    Join Date
    Dec 2010
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    Re: TIG filler for 6061 in oceanside environment

    4943 has less magnesium as an alloy. It also has silicon to promote wetting. 5356 has much higher amounts of magnesium and may corrode faster due to that magnesium and lack of silicon. You are right, since the load factor is less, go with the 4000 series filler.
    Weld like a "WELDOR", not a wel-"DERR"
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