i found this while been nosey
What a blast from the past, run on, run off, plates.........................always been stringers all the way!
+1 for stringers
If it was only that simple......the "weave" tensile had "fish-eyes" which only emerge under stress....you cant see them on X-Ray but its Hydrogen....the test piece should be subjected to a hydrogen release treatment (250 oC for 12 hours)....they go blue so thats another sign they werent treated.
Its really all about recrystallisation of the grains.....therefore by putting a big cap on you can cut the Charpy from almost all "as welded" weld metal.....cut it a bit lower, so that it contains more recrystallised weld metal and the results would be better.
On say 20mm plate if you run thin beads, you will probably get better results from say a split layer than a layer of 3 or more stringers. I used to keep layer thickness to less than 4mm and keep the heat input above 1.5Kj/mm (which means a weave) and interpass of 180 oC.
|That would give the best CVN results and hopefully the tensile would hold up....If it doesnt Id allow it to cool a bit more (interpass temp).
You can affect the results by quite an amount by messing around with these parameters....enough to make the difference between passing and failing
One big job we were involved in reported back that all their Tensiles had failed and I had to go straight away.....I could see the test pieces werent blue so they hadnt had the hydrogen release..
We sat them on a radiator overnight
They all passed next day...that was the only difference
Found this......to explain fish eyes......they are a bit of a strange concept
Every day is a school day on this forum
[And having read there ^^ "in a quasi-cleavage mode", there's no need to say what my pic was going to be, were it not for the fact that a) this is a family friendly place, and b) it'd have been a spell on the naughty step for me.... ]
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