AWS A5.7 ERCuAl-A1
ERCuAl-A1
ERCuAl-A1 filler metal is an iron-free aluminum bronze. It is recommended for use as a surfacing metal for wear-resistant surfaces having relatively light loads, for resistance to corrosive media such as salt or brackish water, and for resistance to many commonly used acids in varying concentrations and temperatures. This alloy is not recommended for joining.
Because of the formation of aluminum oxide in the molten weld pool, aluminum bronze filler metals are not recommended for use with the oxyfuel gas welding process.
Copper-aluminum weld metals are characterized by relatively high tensile strength, yield strength, and hardness. Depending upon the thickness or composition of the base metal, preheat may or may not be necessary.
Welding in the flat position is preferred. Welding in other positions can be done successfully with pulsed arc welding equipment and welder technique.
| Nominal Chemistry Composition (%) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cu+Ag | Zn | Sn | Mn | Fe | Si | Ni+Co | P | Al | Pb | Ti | S | TOE |
| BAL | 0.20 max | – | 0.50 max | – | 0.10 max | – | – | 6.0-8.5 | 0.02 max | – | – | 0.50 max |
| Minimum Mechanical Properties | |
|---|---|
| Tensile Strength (psi) | 55,000 |
| Tensile Strength (MPa) | 380 |
| Brinell Hardness | 80-110 (500kg load) |