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Subject: Re: Repair welding of stainless casting (25% cr, 20%nickel)
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Date: 09/08/03 at 1:38 AM
Posted by: G
E-mail: kizer45[AT55]msn.com (replace [AT55] with @ to reply)
In Reply to: Re: Repair welding of stainless casting (25% cr, 20%nickel) posted by Jeff on 08/15/03 at 12:42 AM:
In regards to repairing the casting
1. V out crack to be welded.
2. use a filler close in designation to the material being welded.
3. preheating the material will depend on the thickness of th casting. Stainless does not need to be preheated as hot as a cast iron or steel casting, warming it a little may help, if you are really concerned about the casting breaking later on have it normalized at a heat treater.
4. Cleaning the casting is the most important part of welding any casting, remove as many impuritys as possible before starting.
5. Using a tig is a good idea, you will control your heat much better. You may want your high frequency to stay on continuous instead of just start, this will help in the cleaning process during welding, if you have a precleaner on your tig. If not try it anyway.
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