Aluminum can be soldered with an electric soldering iron and tin wire. The key is to use a special flux to remove the aluminum oxide layer. Aluminum conducts heat faster, so use a high-power soldering iron.

Due to its very active chemical properties, aluminum will quickly oxidize in the air to form a dense oxide layer on the surface. First, apply flux to the welding part of the aluminum part, and then put the tin wire on the welding part for preheating. When the temperature rises, the tin Add some flux and solder after the line changes from thick to thin, so that the solder can wrap the tip of the soldering iron, and then use the tip of the soldering iron to rub back and forth at the soldering place. Break the aluminum oxide film on the surface of aluminum components. Since the welding place is covered with molten tin and isolated from the air, it is impossible to produce a new oxide film, and the tin can stick to the aluminum part of the oxide film that has just been removed in time. The equal row of molten tin changes from a spherical shape to a flat shape, indicating that the aluminum part has been firmly bonded to the tin. At this time, stop rubbing and wipe off the remaining solder while it is hot, and then weld it with the wire head or other components that have been dipped in tin in advance. It is very convenient. Aluminum can be welded by fusion welding or pressure welding. The melting point of aluminum is only 660 degrees Celsius, which is too low for brazing.

Welding of aluminum parts by local method, prepare the white powder for sawing glass fiber board in advance, put it on the surface of the welding place, rub the welding surface with a 75w soldering iron until a layer of tin is attached to the aluminum surface, and then use a cloth to mix the white powder and The rosin mixture is removed, and then the general method can be used for welding. It is also possible to mix rosin and iron filings, then use sandpaper to polish the surface of the aluminum part, put the rosin and iron powder on the smooth surface of the weld, rub repeatedly with a soldering iron to coat the aluminum surface with a layer of tin, and then follow the general method. Weld smoothly.

The surface of the welded part of the aluminum part is polished brightly, and then drop a few drops of sewing machine oil, the oil should be sufficient, then use a sharp knife to scrape the welded part back and forth several times, and then use a soldering iron dipped in solder and rosin to rub back and forth on the welded part, and the tin will quickly It will be firmly attached to the aluminum parts. This method is also relatively simple and practical.

The surface of tin wire soldered aluminum is solid, but in fact the mechanical strength is very low, and a slightly larger tear will peel off. The key is that the complex formed on the joint surface is physically infiltrated. Due to the blocking of a part of the oxide layer, the tin-aluminum The affinity is also poor, the welding surface is not fully bonded, and the strength is very low.