AL-COP Braze – Brazing Aluminum to Copper
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Brazing aluminum and copper is tough because aluminum starts to melt at roughly the same temperature at which copper starts to flow. However, the AL-COP braze rod makes the brazing process easier and works both ways: connecting copper into aluminum or aluminum into copper. You can also use AL-COP to patch either base metal. However, when using AL-COP, you still need to be careful not to overheat the aluminum.
The AL-COP rod is a flux-channeled rod, meaning that the flux is inside the rod. You can lay the rod with the flux side down so that the flux can prevent oxides from forming when you’re trying to braze. The flux also won’t corrode, but we still recommend cleaning it off when you’ve finished brazing. It’s best to use a soft reducing flame when brazing with the AL-COP rod. The flux runs out first, and then the alloy melts and wraps around the joint. Although getting a cap on the joint is nice, it’s not the most important part of getting a good connection; you want to draw that alloy ALL the way into the joint.
Allowing the joint to cool naturally is critical, as copper and aluminum have different expansion and contraction rates. The AL-COP kit also comes with a brush to help you clean up the joint.