Thread: Extraction Welding Rod

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I've been welding out broken bolts for 40 years. You don't need any special rod to do it. Used to do it with a stick and now do it with a mig. You do need to stay centered on the broken bolt, but a little slip really doesn't matter. Steel rod doesn't stick to cast iron and a stray arc will not damage the thread enough to make any difference. When you have built up to and welded on a nut, quench it with penetrating oil. If after a couple back and forth turns it should turn right out. If it doesn't, use your torch to reheat and quench again. This works on steel to, but requires a lot more care not to damage the threads. Save your money, the special rod is just hype.
Just a little additional. When working with a bolt in cast, if the hole goes clear through, you can blow it out with a torch and not damage the threads. You will need to run a tap through to clean out the debris.