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PSA: Low-hydrogen rods cleared up my weld porosity on a boiler job
I was always getting tiny holes in my welds on boiler steel, and it drove me nuts. A guy at the supply house told me to try low-hydrogen rods instead of my usual ones. I switched, and sure enough, the welds came out smooth with no porosity. It turns out the moisture in regular rods can cause that when welding thick plates. I had no idea something so simple could make such a big difference. Now I'm curious, what other small changes have a huge impact on weld quality? Especially for pressure vessels where every bit counts. I'd love to hear what tricks you all use.
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sarahs396mo ago
Totally agree with @sam912, drying rods and pre-heat make or break pressure welds lol.
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sam9126mo ago
You're right about moisture causing holes, but calling them 'regular rods' might miss a key point. Low-hydrogen electrodes are made to be low moisture, but they suck up water from the air if you leave them out. For boiler work, that hidden dampness can lead to hydrogen cracking, not just porosity. Always keep them in a sealed container or a warm oven right up until you weld. Pre-heating your steel plates helps too, it drives off surface moisture. Those little steps turn good welds into reliable ones for pressure stuff.
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elliot_wright26mo ago
Used to just grab rods from the open pack on the shelf. Figured if they weren't rusty, they were fine. Sam's point about hidden moisture making cracks, not just holes, is a game changer. Makes total sense why the code books are so strict on storage and pre-heat. Changes how you see the whole job, doesn't it? You're not just laying a bead, you're keeping hydrogen out.
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