Aerospace Material Specification 4189 covers aluminum alloy 4643 in the form of welding wire. Typically used as a filler metal in gas-metal-arc or gas-tungsten-arc welding applications of similar composition to produce joints of low dilution.
A primary use is in 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. This alloy could also offer advantages in brazing type applications on thin sections where dilution ratios are low.
Alloy 4643 is 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
Available in multiple diameters and sizes in straight length wire and in spools
Si Fe Mn Cu Zn Mg Al Be Ti Other impurity Other element
3.6-4.6 0.08 0.05 0.10 0.10 0.10-0.30 Bal 0.0003 0.15 0.05 0.15