Hello Gang
Years ago I used to worry a lot about aircraft companies using MIG

welders on their

4310 frames and components because of all the valid reasons mentioned on

this tread.

Since then, I have studied a couple of dozen wrecked Kitfox, Avid and

other 4130 tube

framed aircraft and found when these planes crash, the frame tubes

always break or

bend near the middle of the tube. None ever failed at the weld.  Faced

with these

facts, I pushed my opx-acetylene outfit in the corner and went out and

bought a MIG

welder for my frame work.
John Larsen

For the most part, I agree, John
I was certified at one time for steel high pressure steam,
Titanium, and SS. I was also a welding instructor for seven
years, have read this thread with curiosity,
and have seen some misinformation, largely based on
hearsay, and home grown welders.

To expound on this would perhaps take enough to
write a book. However, every method has it's place,
and some systems are quite universal.
As far as the MIG controversy is concerned, my statement
that properly executed, MIG or FCAW is capable of
X-ray quality welds still stands, and anyone well versed
in this subject would know that.
Archie

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org