Reply by diverlloyd

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Posted on Another restoration

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3765 posts in 2467 days

#1 posted 09-16-2018 11:28 AM

Good to know !!! I really want to file down the braze would that weaken the integrity of the joint?

- EdsCustomWoodCrafts

Not could but will weaken the joint. Thing is you probably were thinking of making the surface flat, which the brass thickness above the surface is what holds it together, so then it would fail. Just polish the brass if you must otherwise leave it alone. It may fail anyway – no way to know. Just get it usable and put it to work, if it holds up then do more restoration.

- OSU55

Thanks for info!!! Who ever did it didn’t do a great job .. I have seen it done where there isn’t this tumour looking thing on the side of the plane

- EdsCustomWoodCrafts

If done right it should be filed down flat to the surface. A flat to the surface braze or weld is stronger then a convex one. Reason being that there is no stress points at the edges of the fix. The right way would be to drill a hole in the end or ends of the crack( this will stop the crack from continuing). Then grind a groove following the center of the crack on the back side as much as you can to about 1/2 the thickness of the casting. Clamp it down to a metal table or anything to keep it flat. Make your fix braze,silfos or weld and if clamped to the table unclamp it. The table will cause it to cool quicker. Since its cast you want it to cool slowly so it doesn’t crack(I prefer a bucket of sand) cover it or whatever to keep it from cooling to quick. Once cooled now do the same steps to the outside. Now after it’s cooled again file it flat. brazing rods with flux it will be leave a gold colored fix, silfos will be silver, you can also use pure silver to braze with. A weld will also be silver since the filler rod has a high nickle content. Old welders will say pinging the weld as it’s cool will also stop the cast from cracking. I have about a 50% success rate with pinging and about 99% with putting it in a bucket of sand. The fix shouldn’t crack it’s the surrounding material that is prone to cracking.
If you are interested then I would file down what has been done and see how well it bonded to the crack. If looks good then leave it if not then you have a good chance to learn a new skill. Just remember a proper fix should be flat a glob is going to be weaker,uglier and prone to failure.

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