Bonjour Don,
that raises a good question how does one anneal a weld in Chrome Molly?
I went to an excellent seminar in the art of TIG welding with the new Miller
Dynasty Tig welder - very exciting when you consider that not only is the wave
profile adaptible, with the fequency, squaring, node amplitude and duration,
and it can be programed for a start up and cool down exit, etc...... All very
sophisticated - just what the hobbist needs more tools to play with.
Anyway I got all charged up and then relized that I did not know how to apply
the info to Chrome Molly. So can anyone add insight to how one can heat treat
or anneal the chrome molly welds?
Thanks BIll
PS: Does SCCA still allow the thinner wall chrome molly tube?
Is it really a superior tube for strength and repeated weldability?
-----Original Message-----
From: elliottd [mailto:elliottd@look.ca]
Sent: Mon 3/17/2003 6:48 PM
To: Larry Young; fot@autox.team.net
Cc:
Subject: Re: Anti-Roll Bar Materials Question
Larry - I would suggest you check the tensile strength of ordinary mild
steel as well as what the book says for 4140. When you weld the 4140
(or
most other high tensile steels) the heat from the welding will anneal
the
4140 so the roll bar (around the welds) is only the strength (or close
to)
the strength value for ordinary Mild Steel (1010).
Heat treating the roll bar will put the strength you quoted back in -
and it
will be that strength all over. A stronger roll bar will not only add
rigidity to the frame of your TR3A, but it will stay where you want it
to
stay, if the day ever comes where you .......... heaven forbid.
Talk it over with a friendly heat treat shop. They will be able to
explain
it.
Don Elliott, 1958 TR3A, Montreal, Canada
----- Original Message -----
From: "Larry Young" <cartravel@pobox.com>
To: <fot@autox.team.net>
Sent: Monday, March 17, 2003 3:45 PM
Subject: Anti-Roll Bar Materials Question
> After looking at the bars made by Saner, I decided to make an
adjustable
> anti-roll bar for my TR3A. The Fred Puhn book says to use 4130 steel
> for bars up to 1 inch and 4340 for larger bars. I used 4140 steel
for
> mine. Fred Puhn also says to have the bar heat treated to
160-180,000
> psi. I've been running mine without the heat treat. I assume the
heat
> treating will increase the stiffness of the bar. Can someone tell me
how
> much it will change the stiffness of the bar?
>
> In the archives, I've seen past discussions about the effect of
> anti-roll bars on understeer of solid axle TRs. On the top of p.
149,
> Fred Puhn describes how a stiffer anti-roll bar can reduce
understeer.
> Larry Young
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