The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
Amazing what a new ribbon does for a till roll printer !
This is the analysis of the 'Piston Alloy'
mattinker:
Hi Andrew,
I thought that bubbles would be unlikely as your atmosphere doesn't have anything like the hydrogen content that a gas fired foundry has. I've made a de-gasser, (based on "olfoundry man's" one using Argon) that I've started a video on, I just need for the weather to get better so that I can get outside and do some more casting!
Nice to see the results of the Pistonium analysis.
Good news about the vaccination, my ex-mother in-law who is 96 can't get one in Seaford.
Cheers, Matthew
awemawson:
Matthew I used to de-gas aluminium alloys with a simple Argon probe. A length of 15 mm stainless steel plumbing pipe, flattened to seal it at the 'hot' end, with a few 1 mm holes drilled in. Probe connected via flexible pipe to Argon regulator which I set to just bubble up through the melt.
In fact this is why for many years I used straight Argon for mig welding - I was too tight to rent two cylinders! I now have returned the Argon cylinder and have Argoshield which is much nicer for welding but I doubt that it would de-gas aluminium !
mattinker:
Andrew,
I only have Argon, as I've don't use my Mig, most of my life I only had a stick welder! The Mig is up for sale, it a very good 400amp welder, withe a sattelite on 10meters of cable!
Olfoundry man's de-gasser does exactly that, it has two disks (mine are cast iron) bolted together with radial lines scratched into one of them, , the argon is fed from the centre between the two discs the scratches are a few 1/100 of a mm which gives very fine bubbles which apparently pick up the hydrogen more easily. When I get to my air bearing project, I'm going to try using one of the off cuts of graphite to try bubbleing the Ag through.
Frankly, I don't think you'll need it with the induction furnace.
hermetic:
I have seen it said that using a lid on the crucible can reduce the contamination in oil and gas furnaces, you chaps ever use one?
Phil
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