Clapper Zapper posted
Quote:
One technique I have read about, but have never seen performed, would be to electro plate the part with a heavy layer of copper. Shielding from plating areas that re-casing might be desired. Then briefly re-casing for a shallow case, and then quenching in a bath of effervescence. Copper then removed. Anyone ever heard of that?


Pretty common currency in Birmingham around forty years ago; we used a cyanide copper bath. I'm not exactly sure what the following heat treat process was, that wasn't our bag, but it wouldn't have been charcoal; almost certainly gas carburisation. Where edge nodulation occurred the copper had to be machined back to a datum surface, so there was a lot of toing and froing which made it very expensive and thus suitable only for "special" high value parts.

Usually applied to seriously big parts that needed crane hoists, from memory the deposit was around .050", but we went over that quite a bit on occasion.

Eug

Last edited by eugene molloy; 06/02/13 07:29 AM.
Thank you, very kind. Mine's a pint