Total Members Voted: 766
Voting closed: 09/28/2020 08:55 am
Pics taken this evening at the build site.
Quote from: bocachicagal on 08/17/2020 01:28 amPics taken this evening at the build site.S/N on the test barrel says 00309 something so 309 Stainless anyone?? 304 test barrel had similar serial number.
Is it me or does there seems to be a large dent in the side of sn6?
Quote from: penguin44 on 08/17/2020 04:08 amIs it me or does there seems to be a large dent in the side of sn6? Many of us had heard this 1000 timesOfc as you might expect, no rupture on SN6 today because of that dents. SN5 also had dents
Ya'll, I am not convinced that the Starship forward flaps have changed much. They appear to be very similar to the last ones. The inner and outer edges are not parallel in my opinion. See illustration. Thoughts? Photo credit @RGVaerialphotos
Is there a realistic chance that the ambient deformation in the prototypes so far might be related to rings being welded (either as hoops or stacked together) at different times of the day with different temperatures that lead to some slight deformation at different temperatures in a way that might not happen in a climate controlled welding environment?Like, if rings were always expanded to the same degree when welded because they're always 70F or something, would the same little dents show up? As far as I know there aren't any real structural problems with them, just curious about the cosmetics I guess.
Deformation of vessel is a consequence of mistakes in WPS and design and has nothing to do with robotic vs human welder.
Quote from: DusanC on 08/17/2020 01:12 pmDeformation of vessel is a consequence of mistakes in WPS and design and has nothing to do with robotic vs human welder.All things being equal this is true. The welding is the great dis-equalizer. Too hot in one place means shrinkage over a larger area. Dead on robot welding does away with this.
The main reason of deformation is martensite to austenite transformation. Cold-work increases UTS and YTS. This makes the steel hard. But this is reason of appear martensite. Crystals of martensite have a larger volume than crystals of austenite with the same number of atom of metal. At 500 ° C +, martensite converts back to austenite and the steel shrinks. Welding temperature 1500 ° C + and there is a zone of temperature influence of the weld next to one. It doesn't matter what the ambient temperature is, whether a human or a robot is welding, etc. Steel will shrink.In support of my words, I can cite links to Russian-language research article. http://www.rusnauka.com/2_ANR_2010/Phisica/1_57820.doc.htm