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Author Topic: Metal guru's, can this be welded and still be safe to use?  (Read 2979 times)

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Offline michnus

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Metal guru's, can this be welded and still be safe to use?
« on: March 23, 2009, 05:46:35 pm »
The flange on my one 1200 is cracked, all 6 bolt whatever have these cracks. The info I was able to get on it, was that it is not because of over tightening, in fact the bolts have never been loosened since new, still the same rotor.

Other thing is, this is where the brake rotor bolts onto, so it can't be because of the awesome brake power of the 1200, then why would it crack? is this not the kind of thing BMW should know about and at least come to the party as this item cost around R2500 new.
« Last Edit: March 23, 2009, 05:49:52 pm by michnus »

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #1 on: March 23, 2009, 07:43:24 pm »
Technically, yes it can be welded then remachined, but you need a good welder, stupid question front or rear? I assume front?

Design / manufacturing fault if all 6 the same, not good...
« Last Edit: March 23, 2009, 07:46:30 pm by Welsh »
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Offline EssBee

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #2 on: March 23, 2009, 07:44:52 pm »
CliveG on this forum is a welder of some sort...

Offline CliveG

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #3 on: March 23, 2009, 07:59:31 pm »

   Buy a new one.  Alloy goes soft in the heat affected zone when been welded....unless you know what alloy and heat teat it after welding.  It is your brakes, so don`t stuff around.

   Try and find out what cause it. 
   
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Offline EssBee

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #4 on: March 23, 2009, 08:01:38 pm »
Hope you didn't mind that, Clive! :mwink:

ps for what it's worth, yeah, I agree, I wouldn't take any chances with that!

Offline michnus

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #5 on: March 23, 2009, 08:25:23 pm »
Thanks guys, Welsh it is the rear, the reports available on ADVrdier and UKGSER nobody knows why it happens. It sure will be interesting to know. The one thing they rule out is over tightening.

Offline luke

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #6 on: March 23, 2009, 08:26:29 pm »
I wouldn't weld t or even try to, the structure changes too much, and the will fail next to the weld.
looks like a dodgey design if all the bolts have cracked
Grey haired riders don't get that way by pure luck ! !

Offline Adventurer

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #7 on: March 23, 2009, 09:09:32 pm »
Replace IMO, but first take it up with BMW, even though your bike is out of warranty.This should not happen.
If you can keep your head in the midst of all this confusion, you don't understand the situation!

Offline michnus

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #8 on: March 23, 2009, 09:24:34 pm »
Replace IMO, but first take it up with BMW, even though your bike is out of warranty.This should not happen.

Problem is with who at BMW?  ;)

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #9 on: March 23, 2009, 09:26:05 pm »
Looks like they made it out of old melted Doohickeys.

Offline Bakkie

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #10 on: March 23, 2009, 09:27:40 pm »
Looks like they made it out of old melted Doohickeys.

:laughing4:

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Offline BMWPE

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #11 on: March 23, 2009, 09:31:23 pm »
Replace IMO, but first take it up with BMW, even though your bike is out of warranty.This should not happen.

Problem is with who at BMW?  ;)

What is the year model of your 1200
and what mileage have you done
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Offline Jman

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #12 on: March 23, 2009, 09:32:01 pm »
Nee man ry die ding tot hy heeltemal breek!
Hy gaan nog lank hou :mwink:

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #13 on: March 23, 2009, 09:34:05 pm »
Looks like they made it out of old melted Doohickeys.

:laughing4:



 :laughing4:

sorry to hear michnus.  this is something bmw should fix gratis in my opinion.  it is a design fault, all these bikes should be recalled by bmw as safety is a stake.  surely??


Offline michnus

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #14 on: March 23, 2009, 09:53:59 pm »
Shark there's no doubt it's old Doo's.  :imaposer:

BMWPE my bike is a 04 and got 70000km on, I go it when it had just under 9000km on the odo, never been in any accident, well, while with me. I agree with you Mamba, this is not just some bling thing on the bike, it's part of my rear brake and the back wheel bolt onto this cracked piece of metal.
 
We can take bets on the reply I will receive.  :mwink:

Can't help bike out of warranty..this one is obvious.
Serviced by myself, and therefore I could have been the source of the problem.
I had Heindies on the bike which isn't BMW approved and therefore they can't help. 
I am talking BS it's the first time they have seen it, has never happen in the past, first reported case.
Happens when the bike is ridden hot and you go through cold water.

 :oscar:
« Last Edit: March 23, 2009, 09:56:57 pm by michnus »

Offline Plothond

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #15 on: March 23, 2009, 10:08:42 pm »
Shark there's no doubt it's old Doo's.  :imaposer:

BMWPE my bike is a 04 and got 70000km on, I go it when it had just under 9000km on the odo, never been in any accident, well, while with me. I agree with you Mamba, this is not just some bling thing on the bike, it's part of my rear brake and the back wheel bolt onto this cracked piece of metal.
 
We can take bets on the reply I will receive.  :mwink:

Can't help bike out of warranty..this one is obvious.
Serviced by myself, and therefore I could have been the source of the problem.
I had Heindies on the bike which isn't BMW approved and therefore they can't help. 
I am talking BS it's the first time they have seen it, has never happen in the past, first reported case.
Happens when the bike is ridden hot and you go through cold water.

 :oscar:


Ja well no fine
You are screwed !!!!!!!!!!!!!!!!

I do not even work for BMW and cannot come up with a better excuse - seems like all the bases are covered

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Offline michnus

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #16 on: March 23, 2009, 10:17:04 pm »
Seems Bad Brad sells more parts than BMW.  Another one, I might get, Can't trust what read on the net.  :biggrin:

Well Plottie, this is after I just spend R1k on refurbishing the rear shock last week, the seal blew.  :patch:
« Last Edit: March 23, 2009, 10:17:28 pm by michnus »

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #17 on: March 23, 2009, 10:22:18 pm »
PM Adventurer for his contact of 2nd hand BMW parts - apparently very sorted :thumleft:

Who did your shock refurb?
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Offline RobC

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #18 on: March 23, 2009, 10:23:41 pm »
Thanks guys, Welsh it is the rear, the reports available on ADVrdier and UKGSER nobody knows why it happens. It sure will be interesting to know. The one thing they rule out is over tightening.
Those look like metal fatigue cracks, aluminium alloy is prone to that over time, it brought down many airplanes! I am no engineer but I think it has to do with the rotor heating and cooling causing stress on the bolts that then stress the alloy hub. Similar stuff happens to the mounting "ears" on alternators on cars.
Not kosher for a kraut bike imho. >:D

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Re: Metal guru's, can this be welded and still be safe to use?
« Reply #19 on: March 23, 2009, 10:27:35 pm »
PM Adventurer for his contact of 2nd hand BMW parts - apparently very sorted :thumleft:

Who did your shock refurb?


Nogal a local guy in EL, he can refub any shock, and is very good with enduro bikes. Rob then sure there must be more like this?

Thanks Brink I got them on speed dial.  :biggrin:
« Last Edit: March 23, 2009, 10:28:27 pm by michnus »