All my experience is in gas welding. My brother in law is a welding instructor and worked as a consultant for years for a large welding supply shop. He raised the issue that gas and TIG will yield good welds with practice. MIG OTOH has the ability to let relatively unskilled welders create beautiful looking welds thar are not of high quality and will not be structurally sound.
I also like the fact that with gas welding, stress relief becomes a smaller problem. One that planning and forethought can overcome without serious additional effort. Things like using a propane based torch to preheat large cluster welds.
TIG seems to be the thing for people with the cash or who have production welding plans. I still see most of the people who are building T&F from plans use Gas.
td
john benham wrote:
Hi there,
Happy holidays.
My question is what method should I use in welding a tubeular fuselage, Gas , Tig or Mig?
My skills are low in all but my feeling that is it will be easier with gas and the benefit is also that a stress relieved joint is achieved.
I look forward to the opinions of more skilled and experienced builders than myself.
John
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From: "James B. Mallon" <[EMAIL PROTECTED]>
To: "Tony Dean" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
Subject: Re: [ABML] If this works - Where were we?
Date: Thu, 26 Dec 2002 11:14:22 -0600
Hello everyone
In regard to the Alodine, I would recommend that it ALWAYS be used.
Aluminum is a very difficult metal for primers and paints to adhere to.
Alodine puts a surface onto the aluminum that is corrosion resistant in
itself, and a great base for primers, paints, etc.
I work as a A&P mechanic at an American Eagle heavy maintenance base. All
the aluminum I see in commercial aircraft is protected VERY well from
corrosion. When our sheet metal guys make a repair, the aluminum is
Alodined, the rivets are usually installed 'wet' (dipped in sealant) before
forming, and zinc chromate primer is always used.
Maybe this is why some of our aircraft have close to 30,000 flight hours and
no corrosion problems that I can see.
Ben
----- Original Message -----
From: "Tony Dean" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, December 22, 2002 11:30 PM
Subject: [ABML] If this works - Where were we?
> Gil, thanks for digging into this.
>
> Now where were we? Oh yes, whacking pieces of aluminum into various
> aircraft parts.
>
> Most of the past week and a half I stopped whacking parts into wing ribs
> and got in some quality time with my files. I had about 150 pieces of
> aluminum cut to shape and now I have filed the rough edges on about 100
> of them.
>
> The question on the table was about avoiding cracks when bending. Well,
> after I file all the parts with a bastard cut file I move up to a finer
> cut (still a double cut) file. Once I have all these parts filed I will
> be using a piece of emory cloth with a grit of "FINE". I think this is
> about a 150 to 220 grit in sandpaper, not quite sure of the exact grade.
> All edges will get sanded and polished. I use a couple of scotch brite
> wheels on a drill for final polishing. These are the green and the
> purple Schothbrite discs. After I get all the metal polished with no
> scratches that a fingernail will catch on is when I will start bending
> parts again.
>
> If all goes well, sometime in January I will have enough parts cut,
> trimmed, filed, sanded, and formed to start priming them.
>
> What are peoples opinions about the wash primers? Two part, one part, or
> alodine? I was thinking about using the wash primer for general priming,
> then an epoxy where moisture may linger, and of course a Zinc Chromate
> or Oxide primer wherever aluminum and steel meet. Any other ideas out
there?
>
> Regards
> Tony Dean
>
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