Solder on Cast Iron Block
Solder on Cast Iron Block
(OP)
We are trying to repair rust pits at water jackets on a cast iron block with Solder and so far are unsuccessful. We've tried rod, silver solder with flux, tried arc welding with low melting point nickel rod none of which worked. Is there a way to solder cast iron at low temperature, keep cast iron below 400F?





RE: Solder on Cast Iron Block
RE: Solder on Cast Iron Block
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Solder on Cast Iron Block
RE: Solder on Cast Iron Block
Thank you for the replies. If you have any other ideas, such as a special solder, our rep is out of ideas.
RE: Solder on Cast Iron Block
RE: Solder on Cast Iron Block
RE: Solder on Cast Iron Block
RE: Solder on Cast Iron Block
Often a degreasing solvent will leave a film especially with a porous surface such as yours.
Easy Off or a similar caustic product will saponify oils and greases. A commercial product will also have rinsing agents in it.
If the discoloration is an oxidation issue you might wish to flux the area being discolored.
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Solder on Cast Iron Block
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RE: Solder on Cast Iron Block
When welding CI you really don't want to weld in the strict sense of the word. You really need an artist that paints the metal on to the part, I say this as too many welders want to "dig in" and get a good bond.
If possible clean your part either in molten salt bath or a Pyrolysis Furnace. This can be accomplished at many auto repair shops. Ask if they remove the smut that some times forms
Even though they are not allowed in all cases, Cadmium base products do work.
Another one sold by the heating and air supply companies is the Sil-Fos line of brazing materials. Talk someone in the business as there are several different fluxes.
In the repair of CI either by weld, soldering or brazing the flux or rod coating plays a big role in the sucess or failure.
If all of the above don.t pan out contact arumrao's and ask for his secret formula for "Foundryman's Putty"