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Thread: I can't get 7018 H4 to work but some old 7018 H8's work great

  1. #1
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    I can't get 7018 H4 to work but some old 7018 H8's work great

    just bought 10bs of hobart 3/32 7018 H4R sticks. I can barely get them to start and then they just stick. I have some old 7018 H8 sticks that work just like I want. Is it the H8 vs H4? New sticks are hard to start so I need to allow them to soak up more moisture? Hobart isn't good?
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  2. #2
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    Re: I can't get 7018 H4 to work but some old 7018 H8's work great

    Is your welder ac only?
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  3. #3
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    Re: I can't get 7018 H4 to work but some old 7018 H8's work great

    Hobart 418
    AWS E7018 H4R, E7018-1 H4R

    Data sheet from Hobart : https://www.hobartbrothers.com/uploa.../Hobart418.pdf

    Diameter Polarity amperage Optimum
    Amps Volt
    Inches (mm) range

    3/32 (2.4) DCEP or AC 80 100 90 22.0



    RECOMMENDED WELDING TECHNIQUES:
    ARC LENGTH: Less than half the diameter of the electrode
    FLAT: Angle electrode 10deg - 15deg from 90deg
    HORIZONTAL: Angle electrode slightly toward top plate
    VERTICAL-UP: Use weaving technique
    VERTICAL-DOWN: Not recommended
    OVERHEAD: Use slight weaving motion within puddle
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  4. #4
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    Re: I can't get 7018 H4 to work but some old 7018 H8's work great

    This is going to sound like a dumb question, but did you try bumping up the amperage? Two different variations of 7018, and it sounds like two different companies, means there's an excellent chance you'll have to make adjustments in amperage going between the two rods.

    Adding moisture to 7018 only makes it harder to start, not easier....fresh stuff out of a sealed package should start easier than stuff that's been on the shelf a while.
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  6. #5
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    Re: I can't get 7018 H4 to work but some old 7018 H8's work great

    The h4 compared to the h8 is the allowed amount of hydrogen allowed in that particular electrode. Usually , at least in 7018h4 there is an R after the 4, meaning moisture resistant. I'm guessing that the flux , being different between the 2 , 1 of them most likely has more or less metallic powder. The other thing is possibly your 7018h4 electrodes have absorbed more moisture. Usually the electrodes get " flakey" when the flux has absorbed moisture. The 3-32" electrodes seem to be more prone to sticking than the larger sizes as well. Try briefly sticking one and allow the current to heat up the rod. Those Thunderbolt welders are a little more prone to sticking rods compared to larger machines or inverter machines as well. Good luck getting it sorted out.

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