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Old 01-07-2013, 06:21 AM   #1
disston OP
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Cracked Luggage Rack

I have the Krauser side bags on my '75 R90/6. The racks are chrome. The one on the right side has a crack in the weld that holds one part of it together. It is cracked all the way through for almost one half of it's circumference. So I figure to have this welded and wonder (since I don't do welding) do I look for MIG Welding or TIG Welding or just what do I ask for.

This should be a small job and I can take the racks off if need be but do I or should I remove the racks to weld them? Can it be repaired in place?

The metal inside the cracked area is rusted. Should I clean the rusted part down to bare metal before looking for a welder?

What should this cost me?
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Old 01-07-2013, 06:55 AM   #2
Bill Harris
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Take the rack(s) off and drop them off at the welder. It's thin tubing and he'll need to use his best weld-foo. Let him do the prep. On the cost, "if you have to ask, you can't afford it."



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Old 01-07-2013, 07:03 AM   #3
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I'd look into getting your welder to add a strengthening plate
while he's at it
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Old 01-07-2013, 07:36 AM   #4
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Rack

If you are going to rechrome, it would be much cheaper to buy a good used rack.
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Old 01-07-2013, 08:57 AM   #5
disston OP
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Well I don't think I will rechrome. I think this was broken many years ago in a 360* flip over. The bike has always been just so so. I don't have any bent parts and the bags were not cracked. The front end was slightly bent but I fixed most of that last year. Sub Frame might be slightly bent but if it is it matches the rest of the bike. I have the racks off right now. I'll look around for a welder. Bob's might even do it. Or know somebody who will.
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Old 01-07-2013, 09:50 AM   #6
ME 109
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Mig, tig, arc or braze. All will work.
Tig will be neatest straight up, Mig will clean up, arc if you have to, brazing will be strong enough.

All will destroy chrome in the immediate area.
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Old 01-07-2013, 10:13 AM   #7
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Yeah, method doesn't really matter so much in this case. They'll probably use mig or tig though. Additionally you can have them grind the welds flush and blend them them with the surrounding material. If you don't plan on rechroming, you'll at least want to hit the welds with some paint to keep them from rusting.
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Old 01-07-2013, 10:50 AM   #8
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Don't waste your time. Buy a new side rack for $35 off ebay and be happy. All of this we are saying to encourage you to take an interest in the things that make up the systems on your motorcycle.
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Old 01-07-2013, 11:16 AM   #9
disston OP
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Quote:
Originally Posted by pecos View Post
Don't waste your time. Buy a new side rack for $35 off ebay and be happy. All of this we are saying to encourage you to take an interest in the things that make up the systems on your motorcycle.


You got me good.

Guess I'll look for used racks. I can still use this one. It is pretty solid when on the bike.
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Old 01-07-2013, 11:20 AM   #10
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That was good pecos! I just read the other thread, and that gave me a good chuckle.
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Old 01-07-2013, 12:32 PM   #11
supershaft
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If they are like most all BMW tube saddle bag racks, welding them will not work because they are brazed. Gas, stick, MIG, TIG will make a mess of them. For some reason, nothing but sloppy crap welds can be had anywhere close to brazing. They need to be re-brazed. I braze gussets on them and use the back cross brace. They crack all the time without them.
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Old 01-07-2013, 08:32 PM   #12
ME 109
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Quote:
Originally Posted by supershaft View Post
If they are like most all BMW tube saddle bag racks, welding them will not work because they are brazed. Gas, stick, MIG, TIG will make a mess of them. For some reason, nothing but sloppy crap welds can be had anywhere close to brazing. They need to be re-brazed. I braze gussets on them and use the back cross brace. They crack all the time without them.
I hadn't considered that they were brazed to begin with. I've seen one rack repaired with braze..........prolly why it worked well.

Yes, trying to metal weld near brazing will be difficult. And it will be extremely difficult to remove all the braze from around a tube end.

Braze away.
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Old 01-07-2013, 08:45 PM   #13
supershaft
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Originally Posted by ME 109 View Post
I hadn't considered that they were brazed to begin with. I've seen one rack repaired with braze..........prolly why it worked well.

Yes, trying to metal weld near brazing will be difficult. And it will be extremely difficult to remove all the braze from around a tube end.

Braze away.
I tried to warn one of my old aviation bosses that he should keep his welding rods and his brazing rods separated better and more distinctly. Shortly after I moved on he grabbed a brazing rod while welding on a custom bracket onto a longeron of one of the Travel Air biplane fuselages we had made from scratch. I sure am glad I was not there to hear the cussing!! If I remember right it took the two of us working full time about a month to make one. He had to splice that fuselage and I think he never sold that particular one. He was amazed just how far he had to get away from the brazing in order to get a good weld. I wasn't. I had run into that situation before!
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Old 01-08-2013, 04:20 AM   #14
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Charlie-
If you want to repair it instead of ebay a replacement, locate a BMX bicycle shop and ask who does their weld repairs. I lucked out and a BMX hall of famer, Gary Littlejohn, lives not far from me. He repaired my cracked subframe. Those guys are experts on tube weld repairs. Takes about 15 minutes for a guy who knows what he's doing.
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Old 01-08-2013, 07:38 AM   #15
disston OP
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Quote:
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Charlie-
If you want to repair it instead of ebay a replacement, locate a BMX bicycle shop and ask who does their weld repairs. I lucked out and a BMX hall of famer, Gary Littlejohn, lives not far from me. He repaired my cracked subframe. Those guys are experts on tube weld repairs. Takes about 15 minutes for a guy who knows what he's doing.
Thanks Bill,

I still have the racks sitting on the floor in my room. I looked at them again last night and now I can't find the part I thought was cracked. I'm going to figure this out before I put them back on. Seems that rust collects in the corners and it may not be cracked.

I have to get the rear wheel off and figure out some way to mount a tire. I've never been any good at doing this manually, never. But I think I'm going to try it again. I do this kind of stuff in the Winter because it takes me sooo long.

Only a couple of months and I have to find a job.

Charlie
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