C87600 pump impeller repair filler material 2

[bentov]

We have a pump in for repair, expensive impeller has localized cavitation damage (design problem a separate issue) right where the thin leading edges of the vanes leave the hub area at the inlet eye (web has holes clear through, though not at edges so shape is preserved). The rest of it is still in decent shape. We're interested in weld/braze filling those damaged areas to repair it (would grind smooth & dynamic balance afterwards), know from the manufacturer's specs it's cast in Silicon Bronze ASTM-B584 C87600. We're not welding experts by any stretch - I was thinking of just getting some C87600 alloy material, trying to puddle it in with an oxy-actylene torch.

When I Google various combinations of terms I come accross "Everdur" as a preferred bronze weld/filler material, but the closest alloy match I find is C87300 (95Cu/0Zn/4-1Mn Si), while the C87600 is 90Cu/6Zn/4Si. I'd probably just buy a little of each and experiment, but the C87600 is not exactly laying around in small rod or wire stock . . . In any case, I wonder if we can achieve decent bond strength and similar-to-original surface characteristics (erosion resistance, etc.) by attempting this kind of repair. Any insight/suggestions would be greatly appreciated.

 

[unclesyd]

Al Bronze isn't a very good beginner's alloy. Yes, Everdure will weld\braze it though I would try to match the impeller alloy for repair.

Are you near any water or lake where they might be propeller shop? If there is one near you you might talk with them about rebuilding the pump impeller.

 

[EdStainless]

You need a filler that melts at a lower temp than your 876.
You might try brazing solid pieces of thin sheet material to the vanes. This would give a better surface and better strength.

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