Solder paste manufacturers briefly discuss why aluminum products are not easy to be soldered with solder?

Everyone knows that the weldability of aluminium is not bad! Whether it is easy to weld or not depends first on the weldability of the material, then on mastering the characteristics of the material, and finally on the operation level of the welder! Aluminium has the characteristics of being prone to oxidation and conducting heat quickly When welding, the molten pool is hard to distinguish and the weld seam is prone to porosity! Therefore, when welding, it is necessary to do a good job of pre-welding cleaning, control the air humidity and do a good job of preheating. There are quite a few key points in welding. The following is JJYSolder paste manufacturerLet me elaborate in detail for everyone:

Why are aluminum products not easy to be welded with solder?

1The reasons why aluminum alloy is not welded with solder:

Aluminum alloy is generally not welded with solder because it is very troublesome to operate in practice.

First, heat the aluminum alloy. Then, use sandpaper to grind the parts of the aluminum alloy that need to be welded to remove the oxide film on the surface of the aluminum alloy. Immediately apply paraffin wax to the surface of the aluminum alloy. Since the aluminum alloy is hot, the paraffin wax will melt on the surface of the aluminum alloy immediately, covering the ground surface and preventing the formation of a new oxide film on the aluminum alloy right away. Then you can weld the aluminum alloy with solder, and you will find that the solder adheres to the surface of the aluminum alloy.

2The reason for welding with copper:

The oxides on the surface of copper can be removed chemically (borax). However, the surface oxides of aluminum alloys can only be removed mechanically. Moreover, after cleaning, a paste made of aluminum welding powder must be immediately applied to the area to be welded. The alloy can only be filled with the same material as the aluminum alloy, and the filler must also be coated with aluminum welding powder.

Here, some people may say that they have tried welding, but they want to tell everyone that actually aluminum alloy can also be welded with solder, but the operation is rather troublesome. First, heat the aluminum alloy. Then, use sandpaper to grind the parts of the aluminum alloy that need to be welded to remove the oxide film on the surface of the aluminum alloy. Immediately apply paraffin wax to the surface of the aluminum alloy. Since the aluminum alloy is hot, the paraffin wax will melt on the surface of the aluminum alloy immediately, covering the ground surface and preventing the formation of a new oxide film on the aluminum alloy right away. Then you can weld the aluminum alloy with solder, and you will find that the solder adheres to the surface of the aluminum alloy.