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Chemical stripping
K2-K6:
Sympathise Roy, didn't realise it was "that" tank.
To be fair to work previously done it's very difficult to complete, especially if you try initially to preserve the original with least interference of form.
The original metal pressing to get that shape makes the metal stretch close to realistic limits at points like that, which is why you get a vulnerability along there initially. Looks like braze with bronze is used to repair which is a good material. But if corrosion is present all along there internally then the heat from brazing will advance the corrosion around it (it goes over temp and spits off the surface) resulting in other weak spots failing. You can really just chase your tail like that and never get long term fix because the metal is so thin.
Reluctantly you'd have to cut the section out to replace (you can't stick a patch on outside without changing form) weld in replacement and grind back to final shape. It's still difficult to butt weld (edge to edge) thin steel plate, so someone with that specific experience is needed. A black belt in welding wonky stuff required. You have to keep the weld as low a temperature as possible for best weld integrity, local overheating of the weld site can bring porosity to the join from which you get damp seeping that'll lift the paint.
With that in mind and given the frustration, I'd want to see a repair verified first prior to paint.
If you go with repair, then it may be worth compleing structural to desired level, then run it with primer painted to prove it first for decent time prior to finishing if field trials succeed.
royhall:
--- Quote from: K2-K6 on May 17, 2019, 09:12:02 AM ---then run it with primer painted to prove it first for decent time prior to finishing if field trials succeed.
--- End quote ---
That is a first class idea.
sye:
A quick hunt around uncovered this but don't know if it's the correct one or too expensive?
http://www.ricepaddy.com/gas-tank-suzuki-gs1000e-1978-1979.html
royhall:
Sorry Sye, it's the wrong tank and it's also sold. Mine is a 78/79 GS1000HC. These tanks are rare as the rarest thing ever, due to them being thinner steel the Honda's. Thanks for trying though, keep it up. Cheers.
Laverda Dave:
Roy, you could try giving I Cleenz Machinz a call and gave a chat with George. They use old and very fine blasting media on delicate parts. They are based in Penge, SE London but maybe worth a try? They won't be able to put a patch in but I'm sure they will know someone who can. They will be at the Kempton Park Jumble tomorrow.
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