Was at an open day today and there was a 1940’s era De Havilland Goblin Jet Engine there on a stand. Heliarc (TIG) was perfected in 1941 by Northrup. De Havilland were British.
You can see some welds that appear to be early Heliarc or Oxy Acetylene welds but what has me scratching my head are ones that look to be a series of horse shoe shapes. You can also see a lot of spot welds.
Oh and for anyone wondering the engine on the right is an Allison V12
William Payne
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Miller Syncrowave 350LX
Esab Power Compact 205
BOC 185DC Tig
Esab Power Compact 205
BOC 185DC Tig
William Payne
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I tig weld all the time, I don’t believe it’s TIG welding.Poland308 wrote:The pattern is a result of the weave of the tig welder.
Miller Syncrowave 350LX
Esab Power Compact 205
BOC 185DC Tig
Esab Power Compact 205
BOC 185DC Tig
kiwi2wheels
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Resistance seam welding ?
https://aerospacewelding.com/welding-so ... ce-welding
Resistance Seam Welding per Mil-W-6858
https://de70d6fbd5219ded0a9f-95955c6a61 ... 00.405.jpg
Resistance Seam Welding per D17.2
https://de70d6fbd5219ded0a9f-95955c6a61 ... 00.405.jpg
https://aerospacewelding.com/welding-so ... ce-welding
Resistance Seam Welding per Mil-W-6858
https://de70d6fbd5219ded0a9f-95955c6a61 ... 00.405.jpg
Resistance Seam Welding per D17.2
https://de70d6fbd5219ded0a9f-95955c6a61 ... 00.405.jpg
But were you TIG welding in 1941 when this engine was produced with the "then current" technology?William Payne wrote:I tig weld all the time, I don’t believe it’s TIG welding.Poland308 wrote:The pattern is a result of the weave of the tig welder.
The weld on the second picture doesn't really look like a tig weld. There are several reasons for that. You can clearly see the edges of the pipes, the weld is next to them. The welded area looks concave instead of convex (concave welds are sometimes allowed on inside corner joints for non structural applications, but I don't think that someone would take a gamble with concave weld in aviation.)
This looks to me like a resistance weld.
I'm taking about the second picture.
This looks to me like a resistance weld.
I'm taking about the second picture.
Interesting pattern, thanks for sharing! Given other peoples suggestions, I'm going for resistance seam welding. Looks very similar to some other examples, you can see how one weld nugget overlaps the next, with some material spread over the preceding bead, giving the horseshoe shape.