^^^^THIS^^^^Originally Posted by Bent Ramrod
Malleable iron has a lot of elemental carbon sequestered in nodules, (why it's now called nodular iron). Heating it to fusion temperature, no matter how you do it, will release that carbon, and the metal once cooled will be hard and extremely brittle.
Once upon a time I worked in an industrial plant where we did furnace brazing. One part we did was a fuel spray ring for a GE jet engine afterburner. There are high strength eutectic brazes that will do that job extremely well, and will easily handle casting temperatures once set, but every surface you do NOT want braze on must be painted with stop-off compound or you'll braze the mold shut for all time. (I spent hours dabbing stopoff into every one of the hundreds of little holes in that ring. Just one hole blocked by the braze would ruin the whole assembly.)
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