"Wayne Cook" wrote in message
...
snip--

I'm afraid I'll have to disagree at least a little in this
statement. I actually believe that 4140 was developed to be a high
strength material that could be welded reliably.


Oh, yeah! It's not that it can't be welded, but more so that when folks
like us weld on it, we're asking for cracks or other problems. When
it's welded to MIL specs, how it's handled is ultra critical, and must see a
heat treat oven in short order.

Just a caution that welding on it like it's mild steel can yield certain
surprises, including a weld so hard you can't do anything with it if
necessary, aside from grinding. Hell, you can weld cast iron with
7018------it just doesn't turn out too well.

Harold