+++ #433
Subject: stay of electrocution
From: Float-by Shooter

But last night I found something that might really interest you. You can
download the complete owner's manual in Adobe .pdf format off Lincon's
website. It wasn't very well linked so I had to do some poking around to
find it, but it is there. If you can't find it, and if you can view
email attachments let me know and I will send it to you that way. I
think it was (only) about 500K. http://www.lincolnelectric.com/

+++ #440
Subject: TIG Machine & Gas Welding
From: Todd Chisum

>I'll jump in to the discussion about Tig welders. I think that one
>thing that would make Tig welding easy for anyone is if you already
>have oxy-acetylene experience.

For those learning to gas weld like me, the book by Richard Finch,
"Welder's Hanbook, a Complete Guide to MIG, TIG, Arc and Oxyacetylene
Welding" (ISBN 1-55788-264-9) is really helping me out on learning about
the different processes. I think the EAA sells it, I got a copy from the
local library.

+++ #441
Subject: Re: TIG Machine & Gas Welding
From: Tom Kennedy

I saw a copy in the local Home Depot the other day.  It was on the shelf
next to their welding gear.

+++ #828
Subject: Re: tanks
From: Donald Schindler

Hi Guys-I wanted to mention a great book for welding aircraft is
"Performance Welding". It is published by TAB books. The author was
chosen by the FAA to redo the welding section in the FAA manuals. What I
like about it is that it takes you by the hand and tells you exactly
what to do i.e.  put the pressure here, clean it with this, exact TIG
settings for the various metals, lots of pictures, and this guy is a
homebuilder to boot. It has helped me alot with my Bearhawk. Take care,
Don

+++ #1226
Subject: Re: Welding
From: budd davisson

If anyone is interested, one of the pieces we'll be reproducing in
www.AirBum.Com is "Zen and the Art of the Weld Puddle". I've got a thing
about puddle control and understanding. I should have the site up
sometime in February. We're also going to run the 11 part welding series
we ran in Experimenter in 1987 (if we can find original copies), which
is actually a serialization of a book I did for the EAA which they never
published because they discovered the video camera.

If we can ever get these damn computers and scanners all talking to one
another, it should be a fun, informative site. I'll let you know when
there's something besides an "under construction" page to look at.

+++ #2174
From: Kelvin Gurney  <kgurney@k...> 
Subject: Re: [Bearhawk] Welding fuse clusters 

   I purchased a set of VHS tapes called "4130 Chromemoly Airframe
Construction".  I had read several good reports before I made my
purchased.  I think they are worth the money.  For someone like me, who
has never assembled an airframe from scratch before it was quite a find.
It has stuff on cutting (don't think those tube cutters I bought are
going to see much use), fitting, jigging, bending, assembling, and
welding.  The format is very informal.  More demonstration and
conversation than classroom instruction.  You can find them at
http://www.tinmantech.com/html/tmvideos_list.html .

   Hopefully other members of this group have seen these and can give
you a second opinion.  They are rather expensive VHS tapes.

+++ #2532
budd davisson  <budd@g...> 
Subject: Re: [Bearhawk] Training wheels... 

I like your idea of an aileron starter kit. We'll work on that. 

About welding, etc. I've been giving welding forums at Oshkosh for
something like 15 years now, twice a week. I start each forum by asking
the same question, "Has anyone here ever seen a weld break on an
airplane while in flight?" I've never gotten an answer to the positive
and I've never seen one myself. I've seen lots break on bad landings,
but never in flight. This is because of the redundant nature of steel
tube design and because of the enormously long weld paths we have for
each joint. A piece of .049 steel an inch wide is capable of holding
about 4400 pounds. If welded you assume less than half of that, 2000
pounds to make up for bad welds and material degradation (this is SUPER
conservative). A 3/4" piece of tubing has a circumference of about 2
1/4" which gives about 4500 pounds. the average cluster has at least
three tubes, but not all are welded all the way around so assume 10,000
pounds. That's a helluva load and isn't likely to be seen in anything
but a crash.

Here's a rule of thumb for welding: Make sure parent material is melted
and there are no sparks. If you do those two things, it's nearly
impossible to have a joint that is actually unsafe. It may be ugly and
not as strong as it could be, but it'll be safe.

Remember, your weld bead is over .25 wide while the parent material is
seldom over .063 thick. If you get any penetration at all, it'll work
out.

You'll really put the icing on the cake if you work hard to make the
welds of even penetration and pretty. And that's what you should strive
for. If you get penetration at the front edge of the puddle and the
puddle is nice and tranquil (not bubbling or boiling indicating it's
getting too hot) then you can play a game and see how evenly you can get
the rod into play to make the ringlets even. It gets to be real fun.

This ain't brain surgery folks!

Personally, I find doing good sheet metal work a helluva lot harder than
steel. I hate it. But then, steel wings seem a little impractical.

+++

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