Topic: Re: A No-PreHeat Cast Iron Welding Technique
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Interesting video with some very good basic techniques and ideas.
Not trying to be critical but I have just a couple observations that are certainly subject to scrutiny by others.
On that first pass, since the outside temp was about 20 degrees and the part was really cold, I think preheating the part to a nice very warm to the touch might have helped with that. On the subsequent passes it was already that temperature and seemed to weld better.
Also, since the test part was not truly cracked it might not weld the same as if it had been. The back side of a cracked part will still have a either a small crack or a least a stress line if was welded it all the way through. Also, welding on the outside of a rounded piece is a little easier to do, since as the cast expands it can spread apart a tiny bit over the radius of the round part. If that were to be done in the middle of the side of a motor block, say a freeze crack to a frost plug, the large flat area on either side of the crack has no where to go and is much more difficult to weld. I realize that's the whole point of the video, keeping the heat out, but those motor blocks are tough to do, at least for me! I might add that an old timer told me recently, on a jod like that to weld across the crack one short weld at a time. I've not had the occasion to try that yet but he said he does it all the time and it works the best. (Hope I don't have tobr> Oh, and that nickle rod... good stuff, but they're pricey little fellas aren't they!?? LOL
I'm sure others will add to this that know a lot more than me for the education of all.
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