Quote:
Originally Posted by Flathead
No one seems to mention brazing anymore, it is a great way to repair cast iron and used to be common practice. I've had good luck with it in the past.
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I'm a big fan of brazing, and have a particular love for silver soldering. The material flows better than brass. I find it a simple and effective solution for many repair situations. One thing I've learned recently is to pay attention to the thickness of the material. Thinner areas of cast iron cool at a much faster rate than thicker areas, and will crack when cooling. Particularly in engine blocks where there is a huge heat sync, the repair will crack if thin.
After applying the solder, immediately peen it, then with a low flame control the cooling down rate, and you will greatly reduce the chance of a cooling crack. You just have to get the feel for the temperature control.