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16-04.-2004, 01:43 PM
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#1 |
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Guest
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6069 aluminum and welding
does uncontrolled heating/melting of this aluminum weaken its
"structure"? does aluminum have a structure? can welding weaken a tube if it's deformed a bit? why do i ask? i have a new mountian bike frame and there's a bulge near one of the welds. the tube is not thin there, as there is no defect on the inside of the tube. just a 1 cm by 3-4 mm slight bulge on the outside of the tube. the manufacturer will exchange it but i don't want to bother if it's just cosmetic. any opinions? i have pictures if necesary. thanks -- |
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17-04.-2004, 01:42 AM
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#2 |
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Guest
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Re: 6069 aluminum and welding
Absolutely. Pic's will help but I think you must accept the
replacement offer!! It gets serious especially on certain areas of the frame where the stresses are at the max such as the joint between downtube and headtube where many manufacturers add gussets at the bottom. In addition, the joints on the tubes frames go through not only tensile or compressive stresses, but also TORSIONS! The bulge reduces the tube strength to withstand torsions. Remember how fatique aluminum mat'ls are. the blur <usenet-forum@cyclingforums.com> wrote in message news:<TvJfc.82897$pK2.81034@fe08.usenetserver.com>... > does uncontrolled heating/melting of this aluminum weaken its > "structure"? does aluminum have a structure? can welding weaken a tube > if it's deformed a bit? why do i ask? i have a new mountian bike frame > and there's a bulge near one of the welds. the tube is not thin there, > as there is no defect on the inside of the tube. just a 1 cm by 3-4 mm > slight bulge on the outside of the tube. the manufacturer will exchange > it but i don't want to bother if it's just cosmetic. any opinions? i > have pictures if necesary. thanks > > > > -- |
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17-04.-2004, 03:45 AM
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#3 |
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Guest
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Re: 6069 aluminum and welding
it's not really close to the actual weld-it's on the side of the top
tube about an inch from the head tube. it's below a gussett weld on top of the top tube. i think its minor-probably cosmetic only. you can feel it and see it if the lighting is right. there's no defect on the inside of the tube(-i can feel through the head tube) -- |
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20-04.-2004, 11:51 PM
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#4 |
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Guest
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Re: 6069 aluminum and welding
the blur wrote:
> does uncontrolled heating/melting of this aluminum weaken its > "structure"? yes > does aluminum have a structure? yes > can welding weaken a tube > if it's deformed a bit? yes > why do i ask? i have a new mountian bike frame > and there's a bulge near one of the welds. the tube is not thin there, > as there is no defect on the inside of the tube. just a 1 cm by 3-4 mm > slight bulge on the outside of the tube. the manufacturer will exchange > it but i don't want to bother if it's just cosmetic. any opinions? i > have pictures if necesary. thanks its not cosmetic, it's structural. take advantage of the manufacturers generous offer & have it replaced. to perform a safe repair requires substantial work, time & expensive equipment making it most unlikely to be an economic exercise. |
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21-04.-2004, 03:37 PM
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#5 |
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Re: 6069 aluminum and welding
In article <2Oahc.24546$yr4.18934@newssvr27.news.prodigy.com>, jim beam <uce@ftc.gov> wrote:
>the blur wrote: >> does uncontrolled heating/melting of this aluminum weaken its >> "structure"? > >yes > >> does aluminum have a structure? > >yes > >> can welding weaken a tube >> if it's deformed a bit? > >yes > >> why do i ask? i have a new mountian bike frame >> and there's a bulge near one of the welds. the tube is not thin there, >> as there is no defect on the inside of the tube. just a 1 cm by 3-4 mm >> slight bulge on the outside of the tube. the manufacturer will exchange >> it but i don't want to bother if it's just cosmetic. any opinions? i >> have pictures if necesary. thanks > >its not cosmetic, it's structural. take advantage of the manufacturers >generous offer & have it replaced. to perform a safe repair requires >substantial work, time & expensive equipment making it most unlikely to >be an economic exercise. Just wanted to add my comments. 2 years ago I discovered a crach in my Cannondale bike in the right chain-stay. The crach was about 3/4 around the tube about 4-5 cm from the dropout, and was caused by an accident 5 years before that. I got the frame welded by a friend, who works with metals at the university in town. I know that the fram will never be as strong as before, but it is a lot stronger compared it's state when I discovered the crack. After all, I have been riding the frame with that crack... and not noticed it. I now use the bike as a spare one when training in bad weather. The new bike is only used during competition and training in good weather. -- Jørn Dahl-Stamnes http://spiderman.novit.no/dahls/ |
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