AWS A5.10 ER4643
Aluminum-Silicon Alloy, Welding Wire — ER4643
Alloy 4643
Alloy 4643 is used for the welding of heavy sections of certain aluminum alloys when multiple weld passes are used and dilution of the base metal into the puddle is negligible. Post weld solution heat treat-ment and artificial aging may develop 90% of the tensile strength of the unwelded base metal in alloys 6061, 6063, 6070, and 6071. This alloy could also offer advantages in brazing type applications on thin sections where dilution ratios are low.
Welds made with alloy 4043 or 4643 filler metal should have approximately equal performance in the as-welded condition.
Alloy 4643 is very similar in weldability to 4043. The weld cracking characteristics, flow, pre-cleaning and machine settings are the same for this alloy as for 4043. The corrosion resistance is very good and equals or exceeds alloy 4043 in the weld zone and heat affected regions.
Specifications:
- ANSI/AWS A5.10 ER4643
- AMS 4189
| Nominal Chemical Composition (%) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Si | Fe | Cu | Mn | Mg | Cr | Zn | V | Ti | Zr | Al | Be | OE | OT |
| 3.6-4.6 | 0.8 max | 0.10 max | 0.05 max | 0.10-0.30 | – | 0.10 max | – | 0.15 max | – | BAL | 0.0003 max | 0.05 max | 0.015 max |