View Single Post
  #27  
Old March 27th 09, 12:49 AM posted to rec.aviation.homebuilt
Brian Whatcott
external usenet poster
 
Posts: 915
Default welding technique for clusters

Stuart Fields wrote:
....
I recall some interesting things that I found in the TIG welded (certified
welder) 4130 tube crashed helicopter,(mine). Some of the breaks in the
tubing were what looked almost like a pipe cutter had made a clean cut just
a short ways from the welded joint. The breaks looked like a brittle
failure. There was little if any distortion to the tube. Very stress
concentrationy type of a break. ...
Stu


That's why some die-hards advocate post TIG or MIG stress-relief with a
torch, and others say: "If I am going to anneal, may as well weld with
the torch and forget the electrics."


Brian W