Re: [PSUBS-MAILIST] Annealing / Heat treat

["James Frankland" <james@guernseysubmarine.com>]

Hey Jim

Sounds really interesting with your stress relieving.  Do you have any pictures you can show us all?  I'd like to see the new cone.  3/4 inch thick!

Anyway, sounds like your making some significant progress, keep up the good work!
James

----- Original Message -----
From: Jim Kocourek [mailto:kocpnt@tds.net]
To: personal_submersibles@psubs.org
Sent: Fri, 21 Nov 2008 06:46:21 -0600
Subject: Re: [PSUBS-MAILIST] Annealing / Heat treat

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 -----
  From: ShellyDalg@aol.com
  To: personal_submersibles@psubs.org
  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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