When connecting copper to steel, what is the recommended brazing filler alloy?

Using a brazing filler alloy with 45% silver is highly recommended when connecting copper to steel due to its excellent qualities. This specific silver content offers a good balance of strength, ductility, and resistance to thermal cycling, making it suitable for applications where there are different thermal expansion rates between the two metals. The high silver content enhances flow characteristics, allowing the filler to easily penetrate the joint and create a strong bond.

When dealing with copper and steel, having a filler material that can accommodate thermal stress due to differing expansion rates is crucial. The 45% silver alloy provides excellent corrosion resistance and mechanical properties, which are essential for ensuring reliability in connection points that may face varying environmental conditions. Overall, this choice ensures both a durable and effective connection in air conditioning and refrigeration systems, where metal integrity is paramount.