I poured about an 85 gram ingot that was 5mm thick by 4" long. After sanding it down smooth and forging all the sides, I rolled it out to about 12" X1"X18 gage. It is all smooth with no fissures, but there is a small area with what look like blisters that appear after annealing. They are on both sides. This happens from time to time and I just roll them down and am careful how I use the piece in finishing. I decided today to cut out this section and do an experiment soldering and finishing a piece from this section so that I can see how it behaves. See the attached picture. Does anyone know what the blisters are or why they happen? The scrap is all clean with solder removed, a magnet used to remove any ferrous bits and the ingot was annealed often.
It’s been interesting to be stuck at home with all of my retail shops closed and no web traffic. I have been able to try some things that I would normally not have had time to do, clean benches, restock chemicals and do the experiment described above. I hope that you are all coping with this mandatory down time and able to stay safe, sane and healthy…Rob