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Can anyone identify these welds on this Jet Engine
Posted: Sat Jan 23, 2021 9:54 pm
by William Payne
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
Re: Can anyone identify these welds on this Jet Engine
Posted: Sun Jan 24, 2021 1:15 pm
by Poland308
The pattern is a result of the weave of the tig welder.
Re: Can anyone identify these welds on this Jet Engine
Posted: Sun Jan 24, 2021 3:52 pm
by William Payne
Poland308 wrote:The pattern is a result of the weave of the tig welder.
I tig weld all the time, I don’t believe it’s TIG welding.
Re: Can anyone identify these welds on this Jet Engine
Posted: Sun Jan 24, 2021 5:09 pm
by kiwi2wheels
Re: Can anyone identify these welds on this Jet Engine
Posted: Sun Jan 24, 2021 7:55 pm
by cj737
William Payne wrote:Poland308 wrote:The pattern is a result of the weave of the tig welder.
I tig weld all the time, I don’t believe it’s TIG welding.
But were you TIG welding in 1941 when this engine was produced with the "then current" technology?
Re: Can anyone identify these welds on this Jet Engine
Posted: Sun Jan 24, 2021 8:24 pm
by Gligor
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.
Re: Can anyone identify these welds on this Jet Engine
Posted: Sat Jan 30, 2021 8:58 pm
by Popcorn
It would have been Oxy acetylene and probably done by women, just like all the Spitfires where.
Re: Can anyone identify these welds on this Jet Engine
Posted: Thu Feb 11, 2021 7:08 pm
by FWE
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.
