Matias
Been here much more than a while
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- Silicon Valley
Didn't realize that one could put dissimilar metals together like that. super cool
Nerd Alert
- Thread starter Bart_
- Start date
The stir welding is really neat. Odd to think of metal in a plastic state and then weld bonding at a relatively low temperature. I believe it's related somewhat to the fluid(?) behaviour of metal in high energy ballistics or maybe that's altogether different again. I wonder if the lower heat distortion and deeper joint penetration of laser is used in shipbuilding now because of all the extra effort they currently take to un-heat-warp all the decking panels etc that are warped by the traditional welding? Or maybe its a simple horsepower thing where torches and arc are simply the V8 powerhouses that even with their power require multiple passes. Another vid showed Elon's tig-before vs laser-after, night and day. Same guy had a vid about spray (plasma) metallization where you could coat aluminum or zinc directly on steel or hardcoat or build up worn shafts or cylinder bores. One spray device had supersonic diamonds in the jet spray. With enough power and IIRC a bit of oxygen in the shield gas you can spray (plasma) weld mig with virtually no spatter.
Reach
Been here much more than a while
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- Atglen, PA
I'm not sure how dissimilar, but I do know it works to weld together a piece of hardened steel and a piece of a tough softer steel, to make a strong gear with a shaft that can handle torsion forces, for example.
I don't think it will weld together a piece of steel and a piece of aluminum, or such as that.
Matias
Been here much more than a while
- Location
- Silicon Valley
Well that's still pretty cool. Not as crazy as what I had imagined, but that would be asking a lot
Reach
Been here much more than a while
- Location
- Atglen, PA
Looks like my memory was a little off, you can weld aluminum to steel! And some other pretty crazy combinations too!
Friction Welding Dissimilar Metals | American Friction Welding
One of the most significant benefits of friction welding is welding dissimilar metals with a high strength bond as strong as the parent materials.
teamafw.com
I finally found the Briggs and Stratton 3rd electrode in their spark gap tester Mystery. The teaser electrode doing some pre-ionization for spark consistency. Dimensions etc to make it.
NACA report 202 from 1925!!! about 4 pages from the end. Briggs goes way back. I found a couple facsimile drawings in aircraft magneto tester manuals that agree. In self derail, the aircraft magnetos were neat in that to generate enough spark at two hands on the prop yank rpm, a little mechanical centrifugal (like decomp) mechanism with a spring like in a pull start would not transmit rotation, then release the spring force for a short rotation speed burst - voila spark - and retard the timing about 30 degrees so the prop wouldn't kick back and rip your hands off. I guess one spark on one cylinder to start(?) Some clever dude designed that.
ntrs.nasa.gov
Some power equipment mfs still Echo their design
edit - I think I found a(different) forum post made by AI that interpreted 2 ground electrodes on a spark plug to be my inquiry and then referenced this ancient discussion about spark delay! Who'da thunk.
NACA report 202 from 1925!!! about 4 pages from the end. Briggs goes way back. I found a couple facsimile drawings in aircraft magneto tester manuals that agree. In self derail, the aircraft magnetos were neat in that to generate enough spark at two hands on the prop yank rpm, a little mechanical centrifugal (like decomp) mechanism with a spring like in a pull start would not transmit rotation, then release the spring force for a short rotation speed burst - voila spark - and retard the timing about 30 degrees so the prop wouldn't kick back and rip your hands off. I guess one spark on one cylinder to start(?) Some clever dude designed that.
The sparking voltage of spark plugs - NASA Technical Reports Server (NTRS)
This report has been prepared in order to collect and correlate into convenient and useful form the available data on this subject. The importance of the subject lies in the fact that it forms the common meeting ground for studies of the performance of spark generators and spark plugs on the one...
Some power equipment mfs still Echo their design
edit - I think I found a(different) forum post made by AI that interpreted 2 ground electrodes on a spark plug to be my inquiry and then referenced this ancient discussion about spark delay! Who'da thunk.
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1933 or 35 electrical engineering to bend your brain. They built and calibrated a photographic oscilloscope to measure spark voltage and current! 8 years of tech advancement.
edit - further to the UV light ionization enhancement from the teaser, Nuclear Plugs from wikipedia:
" Polonium spark plugs were marketed by Firestone from 1940 to 1953. While the amount of radiation from the plugs was minuscule and not a threat to the consumer, the benefits of such plugs quickly diminished after approximately a month because of polonium's short half-life, and because buildup on the conductors would block the radiation that improved engine performance. The premise behind the polonium spark plug, as well as Alfred Matthew Hubbard's prototype radium plug that preceded it, was that the radiation would improve ionization of the fuel in the cylinder and thus allow the plug to fire more quickly and efficiently.<a href="https://en.wikipedia.org/wiki/Spark_plug#cite_note-19"><span>[</span>19<span>]</span></a><a href="https://en.wikipedia.org/wiki/Spark_plug#cite_note-20"><span>[</span>20<span>]</span></a> "
edit - further to the UV light ionization enhancement from the teaser, Nuclear Plugs from wikipedia:
" Polonium spark plugs were marketed by Firestone from 1940 to 1953. While the amount of radiation from the plugs was minuscule and not a threat to the consumer, the benefits of such plugs quickly diminished after approximately a month because of polonium's short half-life, and because buildup on the conductors would block the radiation that improved engine performance. The premise behind the polonium spark plug, as well as Alfred Matthew Hubbard's prototype radium plug that preceded it, was that the radiation would improve ionization of the fuel in the cylinder and thus allow the plug to fire more quickly and efficiently.<a href="https://en.wikipedia.org/wiki/Spark_plug#cite_note-19"><span>[</span>19<span>]</span></a><a href="https://en.wikipedia.org/wiki/Spark_plug#cite_note-20"><span>[</span>20<span>]</span></a> "
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Matias
Been here much more than a while
- Location
- Silicon Valley
That was a cool story
I just watched some live NASA feed from the Artemis 2 launch and they had a camera at the rear of the craft looking back at earth. No blue marble as its cloudy weather. The earth was a crescent and you could slowly see the rotation into sun rise. The sun was just coming up outside my window. Then I realised I was watching my own sunrise from 40,000 miles away in outer space live as it happened!!
A while later the camera view angle wrt the craft body rotated about 15 degrees and the exposure whited out both the craft rocket engine and earth crescent. cool. I think the camera was mounted on the deployed solar panels because it made sense that the rotation would square them up to the sun. more cool.
edit - I'm re-thinking what I saw. I presumed the rocket was flying nose-first towards the moon. It may be coasting rockets-first instead, What I thought was terrain contrast rolling slowly into view may have been moon landscape shadows slowly changing due to camera exposure change. I just saw a far side solar panel move right after the camera view jiggled. Odds are the camera is on its own mast. The exposure is un-whiting and the rocket motor etc details are re-appearing. I'm now thinking the crescent is the moon because I just can't accept the probability that the earth is totally cloud covered eg the 25% that's visible in the shot.
Was fun to imagine while it lasted though
edit 2 - I'm happy again. Looks like I was right the first time. Likely little "blue" marble just due to camera.
www.nasa.gov
edit3 - someone has to do a Neil Degrasse Tyson on this - orbit orientation and direction, relative earth spin, and if the visible sunlight edge is dawn or dusk (?)
A while later the camera view angle wrt the craft body rotated about 15 degrees and the exposure whited out both the craft rocket engine and earth crescent. cool. I think the camera was mounted on the deployed solar panels because it made sense that the rotation would square them up to the sun. more cool.
edit - I'm re-thinking what I saw. I presumed the rocket was flying nose-first towards the moon. It may be coasting rockets-first instead, What I thought was terrain contrast rolling slowly into view may have been moon landscape shadows slowly changing due to camera exposure change. I just saw a far side solar panel move right after the camera view jiggled. Odds are the camera is on its own mast. The exposure is un-whiting and the rocket motor etc details are re-appearing. I'm now thinking the crescent is the moon because I just can't accept the probability that the earth is totally cloud covered eg the 25% that's visible in the shot.
Was fun to imagine while it lasted though
edit 2 - I'm happy again. Looks like I was right the first time. Likely little "blue" marble just due to camera.
Artemis - NASA
www.nasa.gov
edit3 - someone has to do a Neil Degrasse Tyson on this - orbit orientation and direction, relative earth spin, and if the visible sunlight edge is dawn or dusk (?)
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