Douglas;
I have restored a number of old British exhaust pipes, and as Steven Shipley
wisely surmises, many of them are woefully thin in the sharp bend areas of
the pipe.
Also, there may be some rust damage resulting in dimpling of the surface.
For this reason, the wisest choice is usually also the easiest:
oxy-acetylene low temp. brazing with a flux coated bronze rod. You can flow
this over the thin areas and cracks, and carefully take the bronze back down
to the original surface contour. The easiest way to do this is with a
hand-held belt sander with fine-grain belt material.
The bronze takes plating well. A workman-like job can yield an undetectable
result.
Occasionally and unfortunately, these old pipes cannot be repaired.
Best of luck with your effort.
Dave Munroe
----- Original Message -----
From: "Steven Shipley" <shiples@home.com>
To: "Douglas Shook" <shook@usc.edu>
Cc: "Shop Talk" <shop-talk@autox.team.net>
Sent: Friday, March 16, 2001 4:40 PM
Subject: Re: Welding a motorcycle exhaust pipe
>
> Douglas Shook wrote:
> >
> > Hi all,
> >
> > I need to weld up a crack and small hole in the
> > megaphone/"muffler" of my BSA B50's exhaust. It is thin-wall
> > steel and chromed. After welding, I will need to grind it down
> > and have it rechromed.
> >
> > After taking a welding class, and after spending quite a bit of
> > additional time welding, I am a reasonably competent welder, so I
> > thought I would repair the crack myself.
> >
> > I have an oxy-acetylene welder, and wonder if there are any tips
> > you might have for doing this work (e.g., braze or weld, what
> > type of rod, should I use a MIG instead, etc.). I have a good
> > range of small tips (000, 00, 0), and thought about using the 000
> > with to braze it.
> >
> > This megaphone is from CCM circa 1972, and is not replaceable, so
> > I don't want to ruin it in the process of trying to fix it. :)
> >
> > Any advice would be appreciated.
> >
> > thanks,
> >
> > doug
> >
> My concern would be if there's anything there to weld.
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