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  • Users: JHWC
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  1. JHWC

    Rail crack

    Hahaha! Thanks kingnero for the valuable input!! Is really a blessing to learn from so many experts over here. 😊😊😊
  2. JHWC

    Rail crack

    Thanks!
  3. JHWC

    Rail crack

    Hi all, Thanks for the valuable input. Just to clarify, if the web/head is the crack initiation point, do you mean the surface defect is the cause of the rail break? I would assume the crack initation point could also come from inclusion? I a bit confused who is the cuplrit to the rail break...
  4. JHWC

    Rail crack

    Hi experts, Is me again. Could you please advise whether the arrow pointed to the rail is crack origin or final fracture? Since the rail is consistently under compression, i would have expected it to be final fracture instead of crack origin. If it is crack origin, not sure why it appears...
  5. JHWC

    Rail crack

    Thanks!
  6. JHWC

    Rail crack

    Hi Kingnero, Could you explain a bit further? What do you mean by always? And where are the 2 dips that you are referring? Thankss..😊😊😊
  7. JHWC

    Rail crack

    If you look closer, there is a weld dip at the top. 😁
  8. JHWC

    Rail crack

    B side - 2https://files.engineering.com/getfile.aspx?folder=59c313b3-ce56-4e7f-89f3-d7efc2d8ed75&file=Screenshot_20190131-232508_WhatsApp.jpg
  9. JHWC

    Rail crack

    B side. Photo 1 https://files.engineering.com/getfile.aspx?folder=03d65c00-27e3-4ac9-b4de-2c40c4689ec9&file=Screenshot_20190131-232158_WhatsApp.jpg
  10. JHWC

    Rail crack

    I believe several combination may cause the rail crack. Welding is definitely one of them. But i am surprised that it can last for 7 years. Wow. Amazing.
  11. JHWC

    Rail crack

    Haha. Thanks! 😁
  12. JHWC

    Rail crack

    Please see attached. You can see the thermite welding at B side. Thanks. https://files.engineering.com/getfile.aspx?folder=dd73a10b-942b-41ff-80f9-4c14947895ba&file=Screenshot_20190131-232508_WhatsApp.jpg
  13. JHWC

    Rail crack

    Hi Experts, Would like to seek your opinion on the rail crack (see attached). Please advise. 1. Is that consider a beach mark around the circular patch? To me, it seem more like an oxidation rather than beach mark. 2. Consider thermite welding was performed to this rail 7 years ago, how will...
  14. JHWC

    Grease applied to Motor Bearing.

    Hi Experts, May I ask for normal equipment (point machine in railway), what are the type of grease that can be applied to the motor bearing? Information: Equipment placed: Viaduct Temperature: Could be around 25 to 45 degree Environment: Normal/High vibration due to train passes Please...
  15. JHWC

    Determine the actual burnt of metal (Internally or Externally)

    Another photo attached. https://files.engineering.com/getfile.aspx?folder=2752b264-68de-4080-aa99-3cef42cc536e&file=IRJ_2.jpg
  16. JHWC

    Determine the actual burnt of metal (Internally or Externally)

    Hi All, This is IRJ. Attached some of the photos. Wondering what could be some of the causes that create the burnt IRJ. Is there any possibilities that would prevent from IRJ burnt? for example, fire resistance coating? Thanks...
  17. JHWC

    Determine the actual burnt of metal (Internally or Externally)

    Hi Compositepro, it is electric rail. The burnt occurred between 2 materials. The center material is a weaker materials (Insulated Rail Joint). Just wondering which one of the two will burn first. Hi IRstuff, will check with the respective engineer if there is any coating coated. Just...
  18. JHWC

    Determine the actual burnt of metal (Internally or Externally)

    Hi All Experts, Just a question, I am dealing with a burnt metal which is used in the track railway. Recently, there was a burnt on the metal, probably due to arc flash or arc blast. My questions are as follow: 1) Based on visual inspection, would we able to determine whether the burnt...
  19. JHWC

    Drilling of Hole + Tapered Screw Dimension

    Hi dgallup, racookpe1978, Thanks for the feedback. I have concern over here and I will summarize in point form. a) On paper, the hole dimension is 22 mm. On the actual site, it was 21.70mm. b) The drill bit that was used to drill the hole stated diameter of 22 mm. However, when measured...
  20. JHWC

    Drilling of Hole + Tapered Screw Dimension

    Hi racookpe1978, Yes, the copper lug used here allows the current to return to the substation. Due to the company policy, I cannot disclose the ORIGINAL drawing but I believe the updated document attached should have answered all your questions. Hope it helps...

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