Which aluminum alloy is used as filler wire for welds on substation aluminum bus work?

The aluminum alloy used as filler wire for welds on substation aluminum bus work is 4043. This alloy is specifically formulated for use in welding applications and offers excellent weldability and corrosion resistance, which are crucial for substation environments.

4043 alloy is composed primarily of aluminum with silicon as the predominant alloying element. This composition helps in reducing the thermal expansion of the weld, promoting better compatibility with the base materials and enhancing the overall integrity of the welded joint. It also contributes to producing a smooth and visually appealing weld bead.

In substation applications, where equipment is subject to varying weather conditions and potential electrical loads, ensuring that filler materials have appropriate mechanical and physical properties is essential. This makes 4043 the preferred choice for reliable and durable welds in aluminum bus work.

Other alloys mentioned may not possess the same level of weldability or could be better suited for different applications, which is why they are not used as filler wire for this specific purpose.