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Re: 1928 compresser ,cast part broke.
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Posted by Bob - MI on January 14, 2005 at 10:57:15 from (66.14.205.20):
In Reply to: 1928 compresser ,cast part broke. posted by oliverdave on January 14, 2005 at 06:25:19:
My guess is that the part is cast iron? If so, this is tough to weld, actually bordering on impossible at times. When iron cracks, there is significant stress on the part and the material is embrittled throughout the region. Chances are this is a fatigue crack which has worked it"s way through the grain structure until it caused failure. Older parts have naturally aged and that lowers ductility. Lower ductility = brittle. That"s what sunk the Titanic, low ductility iron hull plates, embrittled by poor microstructure and low temperatures resulting in large holes on impact. Brazing is often the only way to do repairs and success is hit and miss. Repaired parts crack due to localized temperatures ramping up and down that create more stress and more cracks. Gradual heating of a wider area followed by a slower cooling cycle helps quite a bit. Whatever you do it should be gradual. No water quenching. If there is a tool and die shop in your area that does repairs on cast iron Permanet Mold casting tooling, they will have experience with iron repairs and would be good to talk to. Cast iron dies are getting more scarce due to repair difficulties but they last quite a while and there are still shops out there that can do repairs. Good luck
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