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Old 03-12-2012, 07:04 AM   #2551
Twin-shocker
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I need to modify a cast aluminum Gas Gas swinging arm, and wonder whether or not 4043 is the filler material to use here?
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Old 03-12-2012, 07:44 AM   #2552
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Quote:
Originally Posted by Twin-shocker View Post
I need to modify a cast aluminum Gas Gas swinging arm, and wonder whether or not 4043 is the filler material to use here?
What grade of cast is it, and define Modify.
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Old 03-12-2012, 09:55 AM   #2553
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I have someone finding out material spec from Gas Gas factory, and I will be welding on shock mounts so the mono swinging arm can be fitted to twinshock bikes. I guess 4043 is the best possible filler rod, as the cast is likely to have quite a lot of silicone, and have always found using harder filler on things like this very often leads to cracking.
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Old 03-12-2012, 11:34 AM   #2554
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Quote:
Originally Posted by Twin-shocker View Post
I have someone finding out material spec from Gas Gas factory, and I will be welding on shock mounts so the mono swinging arm can be fitted to twinshock bikes. I guess 4043 is the best possible filler rod, as the cast is likely to have quite a lot of silicone, and have always found using harder filler on things like this very often leads to cracking.
Depending on what the GG guys says, you may check out the 4047 also.
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Old 03-12-2012, 11:45 AM   #2555
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Quote:
Originally Posted by Twin-shocker View Post
I have someone finding out material spec from Gas Gas factory, and I will be welding on shock mounts so the mono swinging arm can be fitted to twinshock bikes. I guess 4043 is the best possible filler rod, as the cast is likely to have quite a lot of silicone, and have always found using harder filler on things like this very often leads to cracking.
I'll be very impressed if you can find out what alloy the swingarm is made from. That info seems to be near impossible to find.

I did a recent swingarm modification. I did a fair amount of research and decided to go with 5052 alloy for the best as-welded (no temper) strength, and 5356 filler rod for the least chance of cracking when welding 5052. I've had the swingarm on my bike for 4000 miles of trail riding with no cracks so far.
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Old 03-12-2012, 12:08 PM   #2556
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I know someone who prepares works bikes for GG, so finding out shouldnt be that much of a problem. Alloy swinging arms made out of cheap low strength extrusions are being sold for 400 here in the UK, so a modified GG arm seems a sensible option.
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Old 03-12-2012, 12:41 PM   #2557
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Originally Posted by Twin-shocker View Post
I know someone who prepares works bikes for GG, so finding out shouldnt be that much of a problem.
That would be great. I'd wait until you know what alloy they use before doing research on filler.
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Old 03-12-2012, 12:45 PM   #2558
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I am waiting...............your swinging arm mod looks good. Can you feel the difference? Stock trail type suspension units are generally very poor, and you can sometimes find one from an MX bike that will fit and which will work a lot better.
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Old 03-12-2012, 02:53 PM   #2559
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I am waiting...............your swinging arm mod looks good. Can you feel the difference?
Yes, it has really helped.
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Old 03-12-2012, 05:02 PM   #2560
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Originally Posted by NitroAcres View Post
#8 cup, 1/16 Gas lens, Series20 torch, Argon @ 15 CFH
Inside is full closed purge @ 5 CFH.
Is that the regular gas lens, or the large?
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Old 03-13-2012, 06:46 AM   #2561
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Originally Posted by pablo83 View Post
Is that the regular gas lens, or the large?
Just the regular one, nothing special.

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Old 03-15-2012, 03:41 PM   #2562
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Just the regular one, nothing special.
Thanks for all the advice. The lens really helps. I still need a lot of practice, but I think I'm on the right path.
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Old 03-16-2012, 02:44 AM   #2563
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I wonder if anyone has advice on welding a swinging arm made from ISO AlCu4MgTi ? Its cast and has been heat treated to T6 level.

Exact spec is: Cu 4.6 Mg 0.25 Ti 0.2 Al
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Old 03-16-2012, 08:12 AM   #2564
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I just finished a 10 hour intro to welding at CU in Boulder and have been returning to the shop to practice laying beads.
The masks provided are self darkening. The instructor set mine at 10. I've been working on MIG welding this week and damned if I can see a thing. I can barely make out the arc and can't see the work piece at all once the lens darkens. Can I lighten the lens enough to make out more detail without hurting my eyes?
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Old 03-16-2012, 08:48 AM   #2565
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Yes you can, the UV protection is on even if the helmet does not change.

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