Today's Message Index:
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1. 01:14 AM - Re: Brodhead impressions from a newbie (clif)
2. 07:03 AM - Re: Brodhead impressions from a newbie (rambog@erols.com)
Message 1
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| Subject: | Re: Brodhead impressions from a newbie |
--> Pietenpol-List message posted by: clif <cdawson5854@shaw.ca>
I don't think I'll be doing any more 4130 brazing.
Hearing a loud bang and seeing your nicely brazed
part split before your eyes does tend to limit your
confidence in the procedure.
Funny thing. There were a number of previously
brazed bits that came out fine. At least they seemed
so until I checked with a magnifying glass and
found some littler cracks in some of the others.
One reference is Finch's Performance Welding -
page 130. Essentialy the same as above and below.
Clif
> --> Pietenpol-List message posted by: "" <catdesign@intergate.com>
>
> I have looked at all the libraries around here and never came up with
anything
> definitive as to why it has become unacceptable (to the FAA) to braze
4130.
> The only thing I could find is a reference (and I am paraphrasing here
what I
> think I remember) saying the brazing material get into the crystalline
> structure of the metal and causes the 4130 steel to crack upon cooling. I
sure
> wish I could find this article again. However, so far I have no luck in
finding
> it.
>
> Chris
> Sacramento, CA
>
Message 2
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| Subject: | Re: Brodhead impressions from a newbie |
--> Pietenpol-List message posted by: "rambog@erols.com" <rambog@erols.com>
The answer is not in 4313 or any other FAA publication that I know of
Gene
do not archive
Original Message:
-----------------
From: Dmott9@aol.com
Subject: Re: Pietenpol-List: Brodhead impressions from a newbie
--> Pietenpol-List message posted by: Dmott9@aol.com
In a message dated 7/31/03 3:06:43 PM Eastern Daylight Time,
Carbarvo@aol.com
writes:
> Can anyone cite chapter and verse about why there are recommendations
against
>
> brazing 4130? I'm not questioning the truth of it, I'm just trying to
cure
> my
> ignorance. This is the second time I've heard this. After the first
time,
I
> went to the best professional welder I know and he couldn't provide any
> background.
How about in here:
<A HREF="http://av-info.faa.gov/dst/43-13/">AC 43-13 Acceptable Methods,
Techniques, and Practices - Aircraft Inspection and Repair
or: http://av-info.faa.gov/dst/43-13/
or: http://www.faa.gov/avr/afs/300/pdf/
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