The bad thing about welding a fan blade back on is the fan will now be way
out of =="balance"== "FT"
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----- Original Message -----
From: "James F Juhas" <james.f.juhas@snet.net>
To: "David Scheidt" <dmscheidt@gmail.com>
Cc: "Shop Talk" <shop-talk@autox.team.net>
Sent: Monday, December 01, 2008 11:35 AM
Subject: Re: [Shop-talk] Welding a cracked fan Blade
> It's supposed to, but I gave some doubts. NDI was my specialty when I
> was in the Air Force many years ago. I don't recall ever magnafluxing
> something that thin. It was usually castings and much heavier pieces.
> I don't know if a sub-surface crack in a steel .060 to .100 inches thick
> would set up a pole that would attract the material. Or if there would
> be any sub-surface irregularity that will show up that would predict
> failure.
>
> I solved my doubts with an electric fan.
>
> David Scheidt wrote:
>> On Mon, Dec 1, 2008 at 10:25 AM, James F Juhas <james.f.juhas@snet.net>
>> wrote:
>>
>>> 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.
>>>
>>
>> will magnafluxing or the like detect cracks that aren't yet at the
>> surface?
>>
>>
>
>
> --
>
> [demime 1.01d removed an attachment of type text/x-vcard which had a name
> of james_f_juhas.vcf]
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