Seawolf submarine welding hydrogen embrittlement failures

One-sentence flag — "I can tell you a story about welding of the Seawolf submarine, and I tracked it down in my opinion to lubricants." Tom does not develop the case here. The hydrocarbon-as-hydrogen-source point is what's being illustrated.

Now where does the hydrogen come from? What's the largest source of hydrogen in the world? Water. The ocean. It doesn't come from the ocean, but it does come from moisture, because moisture is everywhere too. So one of the key areas is moisture. What else contains hydrogen? Hydrocarbons contain hydrogen. So any grease or oil that's around, lubricants — I can tell you a story about welding of the Seawolf submarine, and I tracked it down in my opinion to lubricants. The moisture can even be humidity in the air. So one of the common things — and we'll talk about it some more — are stick electrode coatings.