Did a test weld this morn, tube used is 2.45mm CDS tube, 1.6 tungsten, 1.5mm A15 Filler rod, 90-105 amps, 10 secs post gas flow, gas flow 12ltrs/min and slope down period set at 7 secs, the tube was not purged mind (suspect it would be quite hard to purge the inside of the tube on a whole chassis!!)
Pic is of weld, tube all cleaned up with a flap wheel and filler rod cleaned with acetone.
Next is of the weld cleaned up with wire brush, maybe a little undercut???
And after putting a 10ft bar on the tube, using a sledge hammer on it trying to break the weld, all that happened is tube crush, I decided to cut the welded joint and clean it up with some 320 grit and WD40 to see if I could actually see where the filler/tube had merged, below is a pic
Thoughts? I am perfectly happy with it to be honest and am sure you would find worse welding on some purchsed chassis`s!!!:lipsrsealed: