Post heating a weld of 4130 chrome moly is not annealling but stress
relieving. In chassis fabrication it is absolutely not necessary. This comes
froms over 20 yrs. of experience and am cerified in TIG to nuclear specs on
chrome and also on other metals such as stainless, inconel, monel, hastaloy,
carpenter 20 etc. My personal opinion is unless you are a certified welder
with tons of experience then you should be building your cage out of DOM or
seamless and leave chrome moly alone.Just my 2 cents
>From: "jeff stein" <jstein@sshpl.com>
>Reply-To: ImprovedTouring@egroups.com
>To: <ImprovedTouring@egroups.com>
>Subject: RE: Welding/brazing question
>Date: Wed, 27 Dec 2000 10:44:38 -0500
>
>very interesting
>
>-----Original Message-----
>From: Bill [mailto:webmaster@ImprovedTouring.com]
>Sent: Wednesday, December 27, 2000 10:33 AM
>To: ImprovedTouring@egroups.com
>Subject: Re: Welding/brazing question
>
>
>An interesting side note on the welding issue.... a few years back I worked
>for a championship winning IMSA GTU team. Their main chassis
>builder/engineer was talking to me one day about the construction of the
>chassis. They were 4130 alloy steel and TIG welded throughout. He
>mentioned that over the years he had tried annealing on some chassis and
>had
>not on others. In his (and the veteran crew chief's) opinions, annealing
>was not absolutely necessary. Now these guys were not semi-pro or seat of
>the pants type guys. They have built some of the most sucessful Trans-Am
>and IMSA cars throughout the 80's and 90's.... I'm not suggesting that you
>ignore this annealing advice!!....I'm simply adding other experienced
>viewpoints. Perhaps they had a specific rod material or substitute process
>for annealing...I don't know. Bill Fingerlow was the engineer if you want
>to
>look him up in the Trans-Am paddock these days and ask him how he did it.
>
>Cheers,
>- Bill
>
>
>----- Original Message -----
>From: "jeff stein" <jstein@sshpl.com>
>To: <ImprovedTouring@egroups.com>
>Sent: Wednesday, December 27, 2000 10:14 AM
>Subject: RE: Welding/brazing question
>
>
> > I have welded as a certified aircraft welder and a nuclear reactor
>welder.
> > The trick to any welding of steel or Chrome-molly alloy with tig is to
> > anneal the weld after the welding is complete. Take the entire welded
>area
> > and its surrounding base metal up to a cherry heat close up the car and
>let
> > it cool slowly.
> >
> > When we first went from gas to tig in the aircraft factory, our engine
> > mounts would literally fall apart without the annealing process. Once
>we
> > began annealing the metal there was never a failure. I have welded a
>number
> > of cages which have been through a few incidents with no failure in the
> > weld.
> >
> > Brazing, even done well is never as strong as a properly welded joint.
> >
> > -----Original Message-----
> > From: ajacocks@decisionbasis.com [mailto:ajacocks@decisionbasis.com]
> > Sent: Monday, December 25, 2000 9:49 PM
> > To: ImprovedTouring@egroups.com
> > Subject: Re: Welding/brazing question
> >
> >
> > Quoting webmaster@ImprovedTouring.com:
> >
> > >
> > > Author: ajc
> > >
> > >
> > > I am planning on welding up the cage for my '85 MR2. The cage will be
> > made
> > > out of 1.5"x0.095 4130(chrome-molly)tubing that will be bent by a
>racecar
> > > chassis builder. A friend of my thought that this builder used
>silicon
> > > bronze rod with his TIG welder and so I started researching aircraft
> > > welding (which uses 4130 tubing) on the Internet. I came across a
> > > technical note from the predicessor to NASA, NACA that tested 4130
>tubing
> > > welded and brazed to plate with various configurations and what I got
>from
> > > the note was that most of the failures occurred at the toe of the weld
> > > EXCEPT when the junction was brazed with a large fillet. The GCR
>allows
> > > brazing as an altenative.
> > >
> > > My question: has anyone used silcon bronze to put a chome molly cage
> > > together? If so, was using TIG or oxy-actylene?
> > >
> >
> > Dunno on the cage question, but it is very good to see someone else
>building
> > an
> > MR2 for IT. What region are you in?
> >
> > I will be running a '91 NA in ITS in WDCR, starting next year.
> >
> > +======================================================+
> > |J. Alexander Jacocks Systems Engineer |
> > | Decision Basis Group, Inc. |
> > | 704 Quince Orchard Rd, Suite 306|
> > | Gaithersburg, MD 20878 |
> > |ajacocks@decisionbasis.com (301) 881-1177 x 111|
> > +======================================================+
> >
> >
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> >
> >
> >
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