lastcowboy32 Posted July 24, 2017 Share Posted July 24, 2017 I was working on an old piece of farm equipment last night. The piece that I was working on was a plate welded on to patch some thinning metal. The particular piece of machinery is about forty years old. I've had it for two; so I have no idea when this plate was added. I was using a large conical countersink to add a taper to two bolt holes in the same plate. Explanation: This particular application uses conical bolts and nuts, similar to lug nuts. Anyway, I was countersinking both holes in the same plate. In one hole, the countersink brought out thin pieces of shavings, similar to short drill filings that you would expect in steel. When I removed the countersink, the taper was smooth and shiny. In the other hole, the countersink chattered, no matter what I did. Instead of shavings, it brought up little chips, similar to what I would expect when drilling cast iron. The final taper was not very smooth, it had little tiny ridges all around it that required filing to smooth. I'm assuming that this patch plate started as steel. Could the person that welded it on have done something to one end of it that would essentially revert that section back to cast iron-like properties? Is there a way for me to reverse this with my oxy-acetylene or oxy-propane torch? Thanks? Or perhaps it was done before it was even welded? Maybe they used a torch to cut the piece for the patch and did the damage then? Quote Link to comment Share on other sites More sharing options...
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