I have a question about an M2 form roll we are using to shape some copper wire that has been solder coated with a solder that contains 2% silver. After rolling some 14000 ft. of wire (35 minutes), the "wire track" becomes very visible on the roll as a darkish amber discoloration. The discoloration of and by itself is not a problem, but what happens at the same time is a subtle deterioration of the brightness of the form being rolled onto the wire. That brightness continues to deteriorate to the point where the wire is rejected by QC.
We have studied the roll. There does not seem to be any significant buildup of debris or any other material. The form itself is still good and sharp. On the coated wire itself we can see a very distince "dulling" of the surface finish. The form itself still appears acceptable.
Is it possible that there is some reactivity between one of the alloys contained in the M2 roll and the silver contained in the solder? There does seem to be a direct correlation between the discoloration of the roll and the deterioration of the wire.
I sure would appreciate any help/light anyone might be able to shed on this problem.
We have studied the roll. There does not seem to be any significant buildup of debris or any other material. The form itself is still good and sharp. On the coated wire itself we can see a very distince "dulling" of the surface finish. The form itself still appears acceptable.
Is it possible that there is some reactivity between one of the alloys contained in the M2 roll and the silver contained in the solder? There does seem to be a direct correlation between the discoloration of the roll and the deterioration of the wire.
I sure would appreciate any help/light anyone might be able to shed on this problem.
