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I built a beam with 7018 rod and the other guy used 6010 on the same job...
Working on a boiler rebuild in Gary last month. Two of us were welding support brackets. I used 7018, the other guy insisted on 6010. His welds looked okay until the inspector did a bend test on a coupon. Three out of four of his samples cracked right at the root. None of mine did. The difference was all in the hydrogen control. 7018 needs dry storage and a slower cooling rate but the payoff is way less chance of cracking on thick stuff. Has anyone else dealt with a foreman who still swears by 6010 for everything?
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the_cora4d ago
Used to be a 6010 guy myself, thought it was just tougher for field work. Seeing those bend test results back to back really showed me the difference in hydrogen cracking risk. Switched over to 7018 on anything over half inch and haven't had a failure since.
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susan3504d ago
Oh, just a heads-up (and I love that test too, it really drives the point home), 7018 doesn't actually need a slower cooling rate on thick stuff. It's the opposite, really. You want to keep the interpass temp up and let it cool slow to let the hydrogen out, but the rod itself welds a little faster than 6010.
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