Why do I sometimes see the joint when I weld a platinum ring using pure platinum?
Some platinum rings are lightly Rhodium plated and when you weld, the Rhodium is absorbed into the joint and causes discoloration. I recommend you emery off the Rhodium plating on the shank before you weld. Also, when sizing down, cut a small piece from the ring sizing stock because it will be the same metal as the ring. Hammer thin and make sure the face of your hammer is clean. Use this thin piece as FILLER MATERIAL when welding your platinum ring.
Page last revised March 13, 2000