Aluminum Bike Frame Weld Repair | TIG Time
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- čas přidán 21. 07. 2024
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We received a project to repair off an Aluminum competition mountain bike. There were significant cracks in the swing arm that needed to be diagnosed and welded. Since this is an old bike frame (about 12 years old), there was no available information about the parent material. We decided that it was likely a 6000 series Aluminum and would be best repaired with a 5356 Aluminum filler.
Before welding, we first needed to remove all the paint / primer and groove out the cracks.
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Can we get a follow up on how effective this repair was, long-term?
Very interesting video, specially when you hit the contamination for a while I thought that only happened to me. No matter how much I cleaned every once in a while I would run into what we all saw on the video. Thumbs up on this one!
Does 6000 aluminium bike frames need to be heat treated after been welded, as apparently they are 40% weaker afterweld. Also they need to be realigned after treatment
Many thanks for this video sir! It has provided me some hope as I've recently encountered a fracture on my mountain bike frame. I'll be calling around now to find a good welder! Shalom!
Nice video. I may have to revisit this once I have a proper shop with a TIG welder; my dad has a old Specialized M2 road frame that's got a nasty crack in it... it's an old fatigue crack from an accident a few years prior to the crack's discovery. Goes over 360 degrees in a helix, right where the shift boss got knocked off in the wreck (we had since drilled it out to fit a Cannondale boss set).
What's interesting (and perhaps problematic) is that M2 stands for metal matrix; it's some sort of quasi-exotic aluminum alloy that Specialized had developed at the time. What it is I do not not know but it likely isn't a standard alloy (or wasn't at the time). Wouldn't be the first time a bike company did that either, as the guy who founded Klien bikes added boron (IIRC) to the mix as a stiffness enhancement on existing large-tube aluminum bike frame technology (which was originally developed by cannondale).
Omg you guys are mint, I have a 1993 cannondale track frame here in Ireland that I damaged due to chain coming off, wish you guys were near me as would love it repaired :(
No holes drilled at ends of cracks? I always drill all cracks before lighting up on the repair..
I got myself in a bit of trouble last time I cleaned my weld area with solvent while wearing my leather weld gloves. As soon as I struck an arc the fumes in my gloves lit on fire. It took me a minute to realize the excessive heat wasn't from the torch but from my hands on fire haha no injury but I will use bare hands to apply solvent to the weld area, skin doesn't absorb fumes like my tig gloves.
That's awesome! Hahaha.
Catching yourself on fire is part of welding. And everyone whos used a grinder has burned their crotch wit the sparks. Its part of the game.
How would a small abrasive blast gun work to clean the cracked area, follow up with acetone?
As a welder who rides an aluminum frame bike, i know a little about the production process for what you have there. Basically, it's gonna be 6061 that is turned into T6 after the fabricatrion steps. In other words heat treatments to attain the far far stronger temper throughout the frame. And they go to all that trouble because just welding it won't hold up. I hope that the piece welded here is going back to the manufacturer to run through their heat treat processes again.
Will brazing damage the frame like welding will?
@@JamesWilliams-ji4mg u can do MIG brazing. the heat input to the material is least.they do this for car roofs for visual appearance as well
How much heat do they usually put into this frame to be solidified?
Great video as usual. Can I ask what you did to clean the original paint off?
hey Mr Tig, how is this weld holding up? heat treating is prohibitively expensive, so in my case it's not an option
also have a 20015 cannondale f29 with lots of DENTED tubes Going to try to pull out dents or fill tube with water and freeze out side in winter time for the ICE to expand
If not get buddy to fill dent with Aluminum weld then sand down and fill
I do not know anything about welding and I could understand you. I have a bicycle with an aluminum frame and I was worried because I always hear that it is not possible to repair them but now I know it is possible. Excellent video, thanks.
same. my brother told me that my fixed gear frame (aluminum) are not repairable
Thanks for the tips but wouldn't you need to re heat treat it after? Thanks!
I have Got a alloy 6061 bicycle cracked frame near seat post...is it weldable with which rods and at what amp and temperature..pl guide
i had my 2008 khs xc-204 frame welded , chainstay broke on the one side
Is there a need to heat treat after welding?
Great video and great skills! How much does it cost to weld cracked frame of a mountain Bike?
I have a vintage mountain bike with a cracked frame in 2 places. Just wondering if i can send it to you to look at, evaluate and see if it is repairable. You know what you are doing so let me know.
Nice job
Was the part heat treated after? How detrimental is it, if it's not?
Name of the bike and there have to be info what material it is.
Have a question if anyone can help, I have an original Juiced cross-current electric bike
Want to get larger tires on the rear wheel and don't have much clearance on the bottom
I know it's aluminum, it's painted and in good condition without any scratches. How big of a job would it be to get an eighth of an inch or 1/4 of an inch more clearance for the rear wheel
Can that be sanded down? Or some divots put in where the tire comes closest to the metal? Will that weaken the frame? What a bike shop be able to do that or would I have to call a specialist? Thanks if anyone can help
Used it for a lawn party and it was a big splash!!!
Thanks for repairing this.
Glad we could help, Paul. Post some pictures of the bike back in service over on the forum if you get a chance: www.weld.com/index.php/log-in-to-weekend-warriors/categories
How much did it cost you? Is it still holding up under normal riding conditions?
@@Welddotcom Mr. Tig thanks for the great video. How much do you charge for this same service on the same part of a similar bike? I'm a novice at welding and dual suspension mountain bikes but I can tell that you are the real deal when it comes to welding. Impressive!
@@Welddotcom just subscribed to your blog and CZcams channel. Can't wait to learn from the best and see some of the repairs that have brought back life to otherwise useless contraptions. Thanks!
Hows it holding up? Was it still in alignment, or did the heat throw the geometry off?
How much does something like that come up to ?
I have two thousand two giant ac-1 downhill bike that I tried to repair with that rod aluminum and I just burned bigger holes in it
What about hardening?
7005 is very weldable. It doesn't have the Cu content that the unweldable 7XXX and 2XXX grades do.
Hey mate, I have a 7005 T6 cracked bike frame. Can I weld it without heat treatment?
@@5t3f0 based on my research 7005 is the most weldable bike frame material. It needs "aging" which means it should sit 5-6 days at room temperature after welding.
Don't forget to heat treat after welding.
Donest Aluminum have to be heat treated after welding? I hope you had Paul sign an insurance waiver.
I have a mtn bike swing arm that has a small indentation about an inch long, was wondering if I can send to a tig welder to repair rather than spend $450 for a new one?
It's hard to say without seeing an image, but it's easy enough to find a welder around you and give them a call.
its common to crack again if its not all heat treated again. Thats what i believe happened to one of my old frames
That looks like a giant trance rear triangle
Couldn't you have put the ad break on the time lapse part instead of minimizing the close up, detailed shot?
my thoughts exactly!
Can i cut my 26er bike and welding it with 29er?
Haha no, that dumb. Just buy a 29er.
awesome. I have a 1999 Sepecialized FSR XC the has a 3/8" to 1/2" cracking propagating near the pivot point. Of course the part is not available. I need to find someone with your skill set to fix my gorgeous bike. Are you accepting projects?
If you can post some pictures on the forum, we can take a look and see.
Weld.com thanks, I'll do that. to be clear, on instagram, correct?
6061
Did you heat treat after? Or there is no need to heat treat series 6000s?
No heat treat.
Thanks for responding. What if the welds on my bike got thinner due to metal brush. Do i need to re weld them?
THat's a judgment call. Join our Facebook group and post some pictures. We can take a look and give you some better advice.
@@Welddotcom PWHT should have been done, micro structure will be otherwise very susceptible to cracking. I am not sure if fatigue performance of this welded frame was good :)
In my opinion 7005 aluminum is the best aluminum on the planet!
is posible to weld a cracked frame ... !
why the serial number is defaced
you ever drill out the end of the cracks?
I sometimes use stop drilling techniques when welding thicker materials. This helps avoid additional crack propagation. However, This particular part was fairly thin aluminum and cracks were easily identified. My starts always occur in parent material before the crack and add filler. The same applies for the weld terminations... I always weld past the crack and into clean parent material. As always, add a little extra filler at the end of the weld termination to avoid hot short cracking.
thanks
6160 is commonly used in bicycle parts
6061
incomplete it need rhermical trheat .
for all the europeans: 5356 is AlMg5
:-) just a quick fix of a 20 + years frame
It seems that you assume it is 6000 serie (which make sens) but not T6 (?) temper and you are not explaining why you do or do not need PWHT . I dont get the benefit of this video since your heat affected zone is potentially 70% less strong after this weld repair. Please explain if I missed something?
could be 6061 alloy.. when u weld the toughness around heat affected zone is gone..fyi
6000 series aluminum needs heat treating as the weld areas will be significantly weakened, where as 7000 series does not. So it seems you are giving misinformation in this video!
unless you know the calculated stress on the joint what does that matter. a $5000 watch tells same time a s $5 dollar watch
Why not turn the balance down if it's nasty? I would have turned it down to 65 with that black stuff floating in the puddle.
You defiantly should have cleaned the part much better.
How about putting your advertisement in the small window instead so those who are here to actually watch and learn can actually see what you are doing instead of having a full screen plug of a advertisement that no one is going to buy from anyway. This BS alone will make me go watch Jody instead.
maybe the original owner who the bike was stolen from can get this back........#sanded serial number