That is exactly what I would do, and indeed, what I was going to do when
my MGA fan lost a blade through my left fender well at 6,000 rpm on the
Lightening course at NJMP. Notwithstanding the fact that I picked up
considerable horsepower after I took the fan off, I doubted the wisdom
of making the repair after taking a close look at it. Besides the blade
that broke off, another had a partial crack and would have been next to
go. And this was in September, after a close inspection of the fan in
August revealed no likely defects. The moral is to be wary of
50-year-old steel.
But if you're not racing, and there is no replacement available, welding
as you describe should fix it. I would suggest a careful gas weld on a
beveled seam so as to ensure full penetration and a softer heat temper.
>From what I understand, mig or tig can result in a more pronounced
boundary between the weld and the core metal, leaving it susceptible to
further cracking along that join. The arc weld could probably be
annealed if arc welded by heating it and allowing it to cool slowly.
My comments here are appropriate for a stamped sheet metal blade. If
you're talking about a cast piece, I'm sure a different set of rules
apply, and I have no experience there.
nogera2@att.net wrote:
> I've got a metal ( very thick ) fan blade, which is no longer available,
> that has a crack in one of the blades.
> I'm thinking of drilling a hole at the end of the crack and welding it up
> then grinding the weld flush.
> Anyone see any problem with that or have other suggestions?
>
> Bob
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> You are subscribed as james.f.juhas@snet.net
>
> Shop-talk mailing list
>
> http://autox.team.net/mailman/listinfo/shop-talk
>
> http://www.team.net/archive
>
>
--
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
james_f_juhas.vcf]
_______________________________________________
Support Team.Net http://www.team.net/donate.html
Shop-talk mailing list
http://autox.team.net/mailman/listinfo/shop-talk
http://www.team.net/archive
|