I tried to make this point many times, but didn't get accross the process, I have welded 4130 with acetylene torch ( my landing gears)and they are just fine. Some oxidation by the weld but they clean up with a a little sand blasting with micro beads. Heat treating is unnecessary and extra expensive.
Ron ---------- Original Message ---------------------------------- From: "Mark Youkey" <myou...@cox.net> Reply-To: KR builders and pilots <kr...@mylist.net> List-Post: krnet@list.krnet.org Date: Thu, 1 May 2003 12:39:30 -0500 >The previous discussion a few weeks ago about WAFs, and laser cutting, heat >treating, etc, didn't set well with me. So today I finally found out why. As >it turns out, 4130 steel air normalizes. That means that if you heat it up, >and then just let it sit out to cool down, you have returned it to a >normalized state, and have done the heat-treating yourself. No wonder it's a >cheap process....but paying for that at all sounds like you are overpaying. > >So, my point is, no matter how you make the holes in your WAF's, whether it be >waterjet, laser cutting, drilling, or shooting a bullet through them, there is >no reason to worry about the heat affected zone, or losing the heat treatment. > By setting these on your workbench when you are done making a hole and >waiting a bit, you have effectively normalized the part.....and done it >cheaply. Nice, huh? Just don't throw water or oil on it...that will screw up >the cooling speed and give you potentially unwanted results--hence "Air >Normalize" > >Here's a good website that talks about 4130 steel. >http://www.eaa1000.av.org/technicl/4130.htm > >http://www.eaa1000.av.org has links on it to great pages, including "Technical >Articles" where I found the steel article. > >As promised in my subject line, >http://www.eaa1000.av.org/technicl/antennae.htm is a good article on antenna >installation. Hope this helps. > >Whoever out there is a member of Chapter 1000, great website. > >Mark Youkey >myou...@cox.net >Okalhoma City_______________________________________________ >see KRnet list details at http://www.krnet.org/instructions.html > -- Ronald R. Eason Sr. Pres. & CEO, KCMO Office J.R.L. Engineering Consortium Ltd. 816-468-4091, Kansas City, MO. Jim Eason V.P, 770-446-1291, Atlanta, Georgia Web Page: www.jrl-engineering.com --
