Description: With the addition of nickel, AFM 67 strengthens the weld metal and improves the
corrosion resistance, particularly against salt water. The weld metal has good
hot and cold ductility. AFM 67 is used for welding 70/30, 80/20, and 90/10
copper-nickel alloys. To MIG overlay on steel, first overlay with a layer of
AFM 61. It is also used for dissimilar welding of alloy 200 to copper-nickel
alloys. When gas tungsten or gas metal arc welding with AFM 67, preheating is
not required. Welding is done in all positions. The arc should be kept as
short as possible to assure adequate shielding gas coverage and thus minimize
porosity.
Chemical Composition Requirements for Undiluted Weld Metal: |
| (Cu) |
Copper |
BAL* |
| (Fe) |
Iron |
0.40 to 0.75 |
| (Mn) |
Manganese |
1.00 |
| (Ni) |
Nickel |
29.0 to 32.0** |
(P) |
Phosphorus |
0.00 to 0.022 |
(S) |
Sulfer |
0.01 |
| (Si) |
Silicon |
0.25 |
| (Ti) |
Titanium |
0.20 to 0.50 |
|
All Other |
0.50 |
* Including silver
** Includes incidental cobalt
All values are considered maximum, unless other-wise noted.
Typical As-Welded Tensile Strengths (min.):
- Tensile Strength, psi - 50,000
- MPa - 345
- Elongation, (%) 20
Standard Sizes: 36Ħħ TIG-1/16 (1.6), 3/32 (2.4), 1/8 (3.2), & 5/32 (4.0) 30# spools-.035 (1.0), .045 (1.2), & 1/16 (1.6)
Corresponding Classification in AWS A5.6 is AFM 187 ECuNi.
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