---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Fri 08/01/03: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 01:14:51 AM PST US From: clif Subject: Re: Pietenpol-List: Brodhead impressions from a newbie --> Pietenpol-List message posted by: clif 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: "" > > 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 _____________________________________ Time: 07:03:06 AM PST US From: "rambog@erols.com" Subject: Re: Pietenpol-List: Brodhead impressions from a newbie --> Pietenpol-List message posted by: "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: 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/