Copper / stainless steel welds are examined to determine the extent of diffusion of the stainless steel into the copper. This is undesirable because it significantly reduces the electrical conductivity of the copper. The key to polishing copper / stainless weld is to minimize smearing during cutting and initial grinding and to maintain the integrity of the inclusions in both the copper and stainless steel.
SECTIONING
MAXCUT Abrasive blade (Cat. No. MAX-C or MAX-I series)
MOUNTING
Compression Mounting with Phenolic, Epoxy or Diallyl Phthalate compression mounting resins
POLISHING
Abrasive/surface |
Lubricant |
Force/ sample |
Speed |
Time |
P220 grit ALO paper |
Water |
5-10 lbs |
100/100 rpm |
Until plane |
1 um DIAMAT diamond on ATLANTIS polishing pad |
DIALUBE Purple Extender |
5-10 lbs |
100/100 rpm |
2 minutes |
0.05 um Nanometer alumina on NAPPAD polishing pad |
|
5-10 lbs |
100/100 rpm |
1 minute |
 |
Diffusion of Stainless Steel (gray) into copper, 200X B.F., (as polished) |
 |
Crack formed in Stainless Steel by welding operation, 200X B.F. (as polished) |