Welding vs a new frame?

[nathanwhite]

There's your answer to how it snaped i would guess.

You had tightened it up without the washers in and cracked it and diddnt realise untill you went to tighten it next time useing the washers and cos it was already cracked it snapped.

I would be giving the other side a good check to make sure thats not weakened.

Already have, looks good. Yea, if I'd cracked it the first time, then it's probably a good thing then that I redid it and it broke. Much better then it snapping on a bump at ~100kph 150km from home.

[FJRider]

Already have, looks good. Yea, if I'd cracked it the first time, then it's probably a good thing then that I redid it and it broke. Much better then it snapping on a bump at ~100kph 150km from home.

ANY structural welding on motorcycles (or any vehicle) requires Certification. And welding done by a certified welder (with appropriate paperwork) before a WoF is issued.

Chassis swap will (should) need a few forms fill in for registration purposes ... not usually a biggie. Just a hassle.

[ducatilover]

We could plop the SV motor in the GN?

[FJRider]

Already have, looks good. Yea, if I'd cracked it the first time, then it's probably a good thing then that I redid it and it broke. Much better then it snapping on a bump at ~100kph 150km from home.

150 metres from home at open road speed would not be pleasant .. and I doubt if it would end well.

[nathanwhite]

ANY structural welding on motorcycles (or any vehicle) requires Certification. And welding done by a certified welder (with appropriate paperwork) before a WoF is issued.

Chassis swap will (should) need a few forms fill in for registration purposes ... not usually a biggie. Just a hassle.

Could you elaborate please? If I'm going to do paperwork, I would like to know what exactly.

We could plop the SV motor in the GN?

No. Mine.

150 metres from home at open road speed would not be pleasant .. and I doubt if it would end well.

Theres a reason I'm getting a professional to do it.

[FJRider]

Could you elaborate please? If I'm going to do paperwork, I would like to know what exactly.

Basically ... the same process required for "Boyracer" modifications. Certification is NOT done at an NZTA station. You can ask where your nearest vehicle certifier is at the nearest testing station.

Your local structural engineering workshop will have Certified Welders ... and may help with the paper work.

[bogan]

Basically ... the same process required for "Boyracer" modifications. Certification is NOT done at an NZTA station. You can ask where your nearest vehicle certifier is at the nearest testing station.

Your local structural engineering workshop will have Certified Welders ... and may help with the paper work.

http://www.lvvta.org.nz/ easier to find em on that site I would think, not all that many do bike certs anyway. I'd be surprised if the welding approach is cheaper than just getting that second hand frame.

[Drew]

I'd just get the thing welded, and go for gold. I would expect it to never be picked up in a warrant test, nor even if it needed to be re vinned.

[bogan]

I'd just get the thing welded, and go for gold. I would expect it to never be picked up in a warrant test, nor even if it needed to be re vinned.

Yeh 'compliance' is overrated, for either approach...

[ducatilover]

I'd just get the thing welded, and go for gold. I would expect it to never be picked up in a warrant test, nor even if it needed to be re vinned.

If they can get enough weld on, I'd ride it.

I don't think a WoF testing station has looked at lower linkages on any of my bikes...

[Drew]

Yeh 'compliance' is overrated, for either approach...

If they can get enough weld on, I'd ride it.

I don't think a WoF testing station has looked at lower linkages on any of my bikes...

"enough weld on"? Woh woh woh, what are you even on about? Adding material (filler rod in Tig welding lingo), does not add any more strength to a weld.

I recently learnt this during a conversation with a real bloody clever engineer.

So long as the welder is good, and will give assurance that shit aint gonna break off, I'd be happy as a clam to ride it. Wouldn't effect my decision to buy it if I were in the market either.

[ducatilover]

"enough weld on"? Woh woh woh, what are you even on about? Adding material (filler rod in Tig welding lingo), does not add any more strength to a weld.

I recently learnt this during a conversation with a real bloody clever engineer.

So long as the welder is good, and will give assurance that shit aint gonna break off, I'd be happy as a clam to ride it. Wouldn't effect my decision to buy it if I were in the market either.

yeah, but I know nothing, so I'd ride it anyway

[pete-blen]

"enough weld on"? Woh woh woh, what are you even on about? Adding material (filler rod in Tig welding lingo), does not add any more strength to a weld.

I recently learnt this during a conversation with a real bloody clever engineer.

So long as the welder is good, and will give assurance that shit aint gonna break off, I'd be happy as a clam to ride it. Wouldn't effect my decision to buy it if I were in the market either.

So a 25mm long weld has the same strength as a 50mm long weld...
I think the idea was to make the weld longer... not build up metal in the same place...

Every welder you meet will assure you that there welding won't break....
I have only ever seen one broken weld... That was on a 90ton impact press..
But have seen heaps where the metal right beside the weld has broken..

[katben]

my 2 cents worth, based largely on my experience with push bike frames

don't do waste of time, if its broke by the weld once, it will just happen again, you can't weld and not create a weld affected (heated) area

bite the bullet buy the "new" frame it will cost you a little more upfront but it will probably save you untold hassles (and regret) in the future

[katben]

It's a cast aluminium frame and Phil has expressed concerns that putting the lug back on may render not as strong as when it was originally cast.

just re read your original post

and although the situation is different to what I thought, the piece was organically cast, and not lugs welded on, I still say the same thing

buy a frame, if the guy doing the welding is saying that, he's pretty much telling you not to do it, it won't work

if you do end up getting it welded, please don't sell me your bike