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Hi all,
I just received my cone back from stress releveing. It weighs 675
pounds and to the naked eye shows no distortion, however I am sure it has some.
The thinnest steel on the piece is 3/4 inch thick.
The process is to bring temp up to max 200 degrees Farenheit every two
hours to max and hold for 4 hours then come down 200 degrees every 2 hours. I'm
sorry I forgot to ask max temp. If you really want to know let me know and I
will call them.
I could actually do my entire sub for only about $1,200.00 but am concerned
about dimensional distortion of previously parts like hatch seat and other items
that would be cost prohibitive to remachine. The largest oven is 7 feet wide, 8
feet tall and 18 feet deep.
Best Regards,
Jim K
----- Original Message -----
Sent: Thursday, November 20, 2008 10:56
PM
Subject: Re: [PSUBS-MAILIST] Annealing /
Heat treat
Hi Dan. I've used simple heat treating over the years for various welding
jobs, and even done some basic tempering with old school blacksmith
techniques. It's fun if you like metalworking. I'm curious to see what gets
done to Jim's cone, and how much distortion it causes. I'd guess that for a
piece like Jim's cone, it would be prudent to clamp the cone assembly to
minimize any tweaking of the part, but with a good oven, that may not be
needed. I look forward to any info Jim can give us on the technique and
process as it's applied to his piece.
I've found pre-heating especially useful when welding cast parts, with a
long and slow cool down period.
Frank D.
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