Recent content by JHWC

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

Thanks!

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...

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...

Thanks!

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..😊😊😊

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

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

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

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.

Haha. Thanks! 😁

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

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...

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...

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