4043 aluminum alloy rod
For aluminum, the most commonly used filler rod is a 4043 aluminum alloy rod, and that’s the one I would recommend for most aluminum welding applications. However, aluminum is a tricky metal, so make sure you know what alloy you are welding and what the part will be used for.
Aluminum from its strength and versatility to its corrosion resistance, aluminum offers benefits that make it an appealing material for a variety of industries. The material, however, is not without its challenges when it comes to welding. Because of its low melting temperature and high thermal conductivity, extra care must be taken to prevent burn through on thinner material and to ensure adequate fusion or penetration on thicker material. Using the appropriate equipment— machines that offer Pulsed MIG capabilities or TIG capabilities — is important. So too is selecting the right filler metal and understanding the weld characteristics each type provides.
