Description: AFM Phosphorous Bronze C electrodes are used to join phosphor bronzes of similar compositions. It is also useful for joining brasses and, in some cases, for welding them to cast iron and carbon steel. The higher tin content in AFM Phosphorous Bronze C results in weld metals of higher hardness, tensile and yield strength than in the Phosphorous Bronze A weld metal. The weld metals tend to flow sluggishly, requiring preheat and interpass temperatures of at least 400¨¬F (205¨¬C) on heavy sections. Postweld heat treatment may not be necessary, but it is desirable for maximum ductility, particularly if the weld metal is cold worked.
Chemical Composition Requirements (%):
| ( AL ) |
Aluminum |
0.01 |
| ( Cu ) |
Copper |
BAL* |
| ( Fe ) |
Iron |
0.25 |
| ( Mn ) |
Manganese |
(a) |
| ( Ni) |
Nickel |
(a) ** |
| ( P ) |
Phosphorus |
0.05 to 0.35 |
| ( Pb ) |
Lead |
0.02 |
| ( Si ) |
Silicon |
(a) |
| ( Sn ) |
Tin |
7.0 to 9.0 |
| ( Zn ) |
|
(a) |
| All Other |
0.50 |
*including Silver (Ag)
**including cobalt (Co)
a. These elements must be included in Total Other elements.
All values are considered maximum, unless other-wise noted.
Mechanical Property Requirements (min.):
- Tensile Strength, psi 40,000
- MPa 280 Elongation in. 4 x D 20 gage length, (%)
Standard Sizes: 3/32 (2.4), 1/8 (3.2), 5/32 (4.0), 3/16 (4.8)
