How to solder aluminium components using a soldering iron
You can solder aluminium with a soldering iron and tin, the key is to use a special flux to remove the oxide layer of aluminium. Aluminium's heat transfer is relatively fast, so use a high-power soldering iron.
Aluminium due to the chemical nature of the very active, in the air will quickly oxidize the surface to generate a dense oxide layer, in the aluminium welding first coated with soldering flux, and then will be hot soldering iron dipped in full of tin and then placed in the weld for preheating, to be the temperature rises, soldering flux from thick to thin and then add some soldering flux and solder, so that the solder will be soldering iron head inclusive, and then use the soldering iron head in the weld before and after the friction, the friction distance should not be too large, generally between 3 ~ 5mm to make the tip of the soldering iron, the soldering iron head. 5mm between the tip of the soldering iron to cut through the aluminium oxide film on the surface of the aluminium components. Welding due to the molten tin covered with air isolation is not likely to produce a new oxide film and tin can be promptly stained to just remove the oxide film on the aluminium parts. Waiting for the column of molten tin from the ball into a flat shape, indicating that the aluminium has been firmly combined with tin, then stop friction and wipe off the remaining solder while hot, and then with a pre-dipped tin wire head or other components for welding is very convenient. Aluminium can be welded by fusion welding, pressure welding, the melting point of aluminium is only 660 degrees Celsius is too low for brazing.
First of all, in the aluminium components of the weld a few drops of dilute hydrochloric acid to remove the surface oxide film, wait a few moments, and then add a few drops of thicker copper sulfate solution, until the weld is all covered with copper, water to wash off the excess copper sulfate solution and hydrochloric acid solution, and then 45-75W soldering iron can be welded, and its effect is good.
A piece of aluminium into the crucible temperature melting, and then add 2 to 5 times the tin melting to be used, and then according to the conventional method of welding is very convenient.
In the treatment of clean aluminium surface, coated with a layer of mercuric nitrate solution, with a 100w soldering iron tip on the more eat tin, with a soldering iron tip in the soldering surface while rubbing the side of the mercuric nitrate solution can be coated. This can be firmly welded on. But note: mercury is toxic, to be welded in a ventilated place, and do not use highly toxic mercuric chloride.
Aluminium parts of the earth method of welding, pre-prepared saw glass fibre plate of white powder foam, placed on the surface of the weld, with 75 w soldering iron in the weld surface rubbing until the aluminium surface attached to a layer of tin, and then use a cloth will be white powder foam and rosin mixture to remove, then available in the general method of welding, the practice of this method is simple, the weld effect is satisfactory. Can also take rosin, iron shavings mixed, and then use sandpaper to light aluminium surface, the rosin and iron powder on the surface of the weld, with a soldering iron repeatedly friction to make the aluminium surface ate a layer of tin, and then according to the general method of welding can be smooth.
Aluminium parts of the weld surface polished bright, and then a few drops of sewing machine oil, the amount of oil to be sufficient, and then use a sharp knife in the weld back and forth a few times to scrape, and then use a soldering iron dipped in solder and rosin in the weld back and forth friction, the tin will soon firmly attached to the aluminium parts, the method is also more simple, practical.
Tin welding aluminium on the surface is solid, in fact, the mechanical strength is very low, slightly larger tear will peel, the key is the formation of its bonding surface complex for the physical infiltration, due to a part of the oxide layer of the barrier, tin and aluminium affinity is also poor, the weld surface is very insufficient to combine very low strength.
