[stoneaxe]

Thanks for the video- that was really useful. I did not realize the why of pre and post heating was to allow the hydrogen to disperse, or how much material thickness had to do with it.

From this, I inferred the main reason quenching a welded part is bad, is because it cools it below the point where the hydrogen can disperse out of the weld. 1000 times easier for the hydrogen to disperse at 250F than at 72F. Wow.

The other inference was that poorly maintained 7018 was equivalent to -10 series hi hydrogen rods. IE, it would be OK for use where a 6010 would normally be used. (not for code work , of course.)

 

[stoneaxe]

Here in the north west building bridges, ferry, and container ship docks. Just try to convince a carpenter to close the lid on the gang box. I can’t tell you how many times I had to pour rain water out of a can of 7018

Impossible! It never rains here! That was just a heavy dew.