Quality Engineering and Construction from Wally World
#26
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
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226 Posts
Helmet on head when it happened?
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
#27
Senior Member
It's probably not the thickness of the wall/weld.
After welding any metal (Ti, Al, or steel), unless it's non-structural, and very very few exceptions, there needs to be a post weld heat treat/stress relief, or the weld process itself actually weakens the metal locally.
After welding any metal (Ti, Al, or steel), unless it's non-structural, and very very few exceptions, there needs to be a post weld heat treat/stress relief, or the weld process itself actually weakens the metal locally.
Lots of high pressure ASME code work on pressure vessels and boilers. Welding to the highest standards, often 100% X-ray. Mostly stick and heli-arc. In all positions; lots of overhead and quite a bit of mirror and blind welding--looking through the root from the other side. You can't roll a boiler superheat section or an MSR in a nuke.
I don't know the aircraft industry. I assume it's stringent.
Last edited by boilermaker1; 09-24-19 at 10:25 PM.
#28
Sr Member on Sr bikes
#29
Sr Member on Sr bikes
Steel tubing for bicycles is around 1mm thick. The tubing in the picture looks like it's in that range. I think the problem is that they cut out the hole for the shock mount. I would assume that most mounts like that are welded to the tube without cutting a hole in the tubing. For a really cheap HelMart bike, I would think it would be cheaper. Cutting tubing is an extra step and you have to weld all the way around the mount as well as align it.
Dan
#30
Senior Member
I think the ad on the bottom of the page on the thread actually gives the fix.