Description: AFM Silicon Bronze is a copper-base alloy containing approximately 3 percent of silicon, it may also contain small percentages of manganese, tin, or zinc. It is used for gas tungsten (GTAW) and gas metal arc welding (GMAW) of copper-silicon and copper-zinc base metals, to themselves and also to steel.
Applications: When gas metal arc welding (GMAW) with AFM Silicon Bronze, it is generally best to keep the weld pool small and the interpass temperature below 150¨¬F (65¨¬C) to minimize hot cracking. The use of narrow weld passes reduces contraction stresses and also permits faster cooling through the hot-short temperature range. When gas tungsten arc welding (GTAW), best results are obtained by keeping the weld pool small. Preheating is not required. Welding can be done in all positions, but the flat position is preferred.
Chemical Composition Requirements (%):
| ( AL ) |
Aluminum |
0.01 |
| ( Cu ) |
Copper |
BAL* |
| ( Fe ) |
Iron |
0.50 |
| ( Mn ) |
Manganese |
1.5 |
| ( Pb ) |
Lead |
0.02 |
| ( Si ) |
Silicon |
2.8 to 4.0 |
| ( Sn ) |
Tin |
1.0 |
| ( Zn ) |
|
1.0 |
| All Other |
0.50 |
*including Silver (Ag)
All values are considered maximum, unless other-wise noted.
Hardness and Tensile Strength:
- Minimum Tensile Strength, psi 50,000
- MPa 345
- Brinell Hardness 80 to 100
(average value for an as-welded deposit)
Standard Sizes: .023 (0.6), .030 (0.8), .035 (0.9), .045 (1.2), 1/16 (1.6), 3/32 (2.4), 1/8 (3.2), 5/32 (4.0)
