Hairy Posted January 29, 2015 Posted January 29, 2015 yoh thats a decent weld... that is not gonna budge now. Dude ... that respray ... hahahaha Whatever.jpgIt is not spray .... it is tippex!
rudi-h Posted January 29, 2015 Posted January 29, 2015 The quality of aluminium welding is very sensitive to the shielding gas. Welding on the paint like that means contaminating the shielding gas which compromises the weld quality significantly, hence I would be worried about the penetration of that weld if it were very critical. I'd strip the paint and carefully clean at least 5cm around the weld if it were my bike. That said I also had a alu frame repaired like that and it held for a good 500 km that I rode after the repairs until my warranty frame arrived.
Dirkitech Posted January 29, 2015 Posted January 29, 2015 If you look up "eye sore" in the dictionary, you'll find that little white patch you painted.Fix a cracked aluminium frame R80,Respray a bike R1500,Riding around with a white patch on your frame because you did not have the matching colour, PRICELESS =D seriously Gerrie, that weld seam is sexy
NicoBoshoff Posted January 29, 2015 Author Posted January 29, 2015 The quality of aluminium welding is very sensitive to the shielding gas. Welding on the paint like that means contaminating the shielding gas which compromises the weld quality significantly, hence I would be worried about the penetration of that weld if it were very critical. I'd strip the paint and carefully clean at least 5cm around the weld if it were my bike. That said I also had a alu frame repaired like that and it held for a good 500 km that I rode after the repairs until my warranty frame arrived. I cleaned the frame around the weld with sandpaper to the bare aluminium. The bits where he hit paint was where he "overdid" the weld. The critical part was clean as a baby's bottom. I'm not THAT useless...
Hairy Posted January 29, 2015 Posted January 29, 2015 I cleaned the frame around the weld with sandpaper to the bare aluminium. The bits where he hit paint was where he "overdid" the weld. The critical part was clean as a baby's bottom. I'm not THAT useless...and that after my laborious cell phone types explanation via whatsapp on paint removal ... feels like part of my life has been stolen
madev Posted January 29, 2015 Posted January 29, 2015 Gerrie is one of only a few in the world that can TIG weld lead, seeing that his day job is welding chromo on military airframes makes him more than qualified to handle a bicycle.
Hairy Posted January 29, 2015 Posted January 29, 2015 Gerrie is one of only a few in the world that can TIG weld lead, seeing that his day job is welding chromo on military airframes makes him more than qualified to handle a bicycle.this guy sounds like great find for us poor cyclists!
ren8gor Posted January 29, 2015 Posted January 29, 2015 Gerrie is one of only a few in the world that can TIG weld lead, seeing that his day job is welding chromo on military airframes makes him more than qualified to handle a bicycle.Please PM me his contact details. I have an Alan frame that i would like him to have a look at. Thanks
NicoBoshoff Posted January 29, 2015 Author Posted January 29, 2015 Gerrie is one of only a few in the world that can TIG weld lead, seeing that his day job is welding chromo on military airframes makes him more than qualified to handle a bicycle.Haha, when I asked him "So what's the secret to welding Aluminium" he replied "30 years". His friend that was sitting there said "Ag no, Gerrie, that's a K@K answer", to which Gerrie answered "Well not as K@K as the question". My kinda guy!
Capricorn Posted January 29, 2015 Posted January 29, 2015 The 6XXX series of alloys are the alloys probably most often encountered in structural work. They are relatively strong (although not as strong as the 2XXX or 7XXX series) and have good corrosion resistance. They are most often supplied as extrusions. In fact, if the designer specifies an extrusion, it will almost certainly be supplied as a 6XXX alloy. 6XXX alloys may also be supplied as sheet, plate and bar, and are the most common heat treatable structural alloys. Although all alloys in this series tend to be crack-sensitive, they are all considered weldable and are, in fact, welded every day. However, the correct weld filler metal must be used to eliminate cracking. Additionally, these alloys will usually crack if they are welded either without, or with insufficient, filler metal additions.
NicoBoshoff Posted January 30, 2015 Author Posted January 30, 2015 Went for a quick push up my local DH runs and hit all the harsh stuff (jumps to flat, drop-offs and some high-speed banked corners). Good news and bad news. Good news is the fix held up perfectly. Bad news is the paint job still sucks We figured out what caused the frame to fracture in the first place. It seems the previous owner ran a waaaay too soft coil on the rear causing the bike to blow through its travel too frequently and too harshly, causing the joint to take too much impact unsupported by the suspension. I popped the correct coil on for my weight and set the compression damping correctly and now it's not bottoming out but rather using the coil to fend off the blows. So unlikely a design or material flaw, but rather the metal doing what all metals would have done...it gave up. With the recent TLC it got it should hold now
Squier Posted January 30, 2015 Posted January 30, 2015 Went for a quick push up my local DH runs and hit all the harsh stuff (jumps to flat, drop-offs and some high-speed banked corners). Good news and bad news. Good news is the fix held up perfectly. Bad news is the paint job still sucks We figured out what caused the frame to fracture in the first place. It seems the previous owner ran a waaaay too soft coil on the rear causing the bike to blow through its travel too frequently and too harshly, causing the joint to take too much impact unsupported by the suspension. I popped the correct coil on for my weight and set the compression damping correctly and now it's not bottoming out but rather using the coil to fend off the blows. So unlikely a design or material flaw, but rather the metal doing what all metals would have done...it gave up. With the recent TLC it got it should hold now Nico, I'm sending you a sticker for that paint job... No charge!
FCH Posted January 30, 2015 Posted January 30, 2015 Disregarding the look of the piantjob (it needs stickers asap) my old man always said before taking your vevicle to have serviced; walk into the workshop first thing in the morning or late afternoon and look at the state of the place. If tools are scattered all around and chaos, then leave asap.First thing I noticed is his work bench and shelf; he has pride in his own stuff, so he will do his best to look after yours.Hope the weld holds up as its meant to.
Long Wheel Base Posted January 30, 2015 Posted January 30, 2015 Nico, I'm sending you a sticker for that paint job... No charge! blue_bulls-228x228.gifId rather see the paint job than that sticker
Squier Posted January 30, 2015 Posted January 30, 2015 Id rather see the paint job than that sticker It's called perspective. You're welcome.
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