How to tin soldering on aluminum alloy products?

We may notice that aluminum alloy products are difficult to be tin soldered. Here we can share some our experience on that.

In fact, aluminum itself and tin are mutually compatible, but in practice, we cannot get them to fuse together. The reason is that aluminum is chemically particularly reactive; readily reacting with oxygen in the air to produce a dense oxide film that prevents aluminum and tin from dissolving. Therefore, to use a special flux at high temperature (such as 300 degrees Celsius) to have one chemical reaction to remove oxide film to complete the aluminum alloys soldering.

Note that the iron used for soldering must be high-power, and the actual temperature of the iron head is more than 300 degrees (especially for large parts because of fast heat dissipation and fast temperature drop, we should pay special attention to it). During the soldering process, the work-piece should be properly fixed/clamped to facilitate the rapid operation of soldering. At the same time, eye glasses and heat protection gloves should be wore.