[TowerTalk] error

Mon, 27 Oct 1997 21:40 +0100

--- Inkommet från SSS.PL1795 +46 8 55381795                 97-10-27 22.40 -----------------

ngth over??> 100,000 PSI. The weld arc will locally destroy the high yeild ???strength??> yo
? 4?    ?
? 4?    ?
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    id QAA28887; Mon Oct 27 16:17:41 1997
Subject: Re: [TowerTalk] Chrome moly/end caps
Date: Mon, 27 Oct 97 16:17:43 -0500
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To: <CQK8DO@aol.com>, <towertalk@contesting.com>
From: Bill Coleman AA4LR <aa4lr@radio.org>
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On 10/13/97 9:00, CQK8DO@aol.com at CQK8DO@aol.com wrote:

>In a message dated 97-10-10 21:36:01 EDT, you write:
>
><< Do not weld on 4130 in the high temper states ie yield
strength over
> 100,000 PSI. The weld arc will locally destroy the high yeild
strength
> you paid for and provide a discontinuity that provides a site
for cracks
> to start.
>  >>
>
>Just got to reading the mail... I have to take issue with this as
welding
>4130 is how we build aircraft fuselages, race car frames, etc....

But, typically, we don't use high-strength temper treated 4130.
That's
what he's discussing.

> After
>welding is finished the steel is re-tempered in the area of the
weld by a
>process called normalizing...

This is done to releave the internal stresses that might have
formed in
the process of cooling after each weld was done. It is not the
same has a
high-strength tempering that is done on the ENTIRE mast.

And, ironically, Piper aircraft build a large number of
4130-framed
airplanes, and used TIG welding WITHOUT normalizing. There has yet
to be
evidence of a manufacture-induced weld-stress fracture. Something
to say
for quality jigging and professional welding....

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr@radio.org
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901

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