METAL BONDING TECHNOLOGY
Tinning of steel parts
Instead of flux during the tinning of steel parts (including stainless steel) before soldering, you can use a piece of polyvinylchloride tube. The soldering site is also degreased. A sting of a well-heated soldering iron with a drop of solder is triturated on the soldering room into a section of this tube until a uniform layer of the half-ice is obtained. Then lead the ration, as if usually.
Soldering of galvanized steel with zinc or cadmium
Soldering of nichrome
Soldering (nichrome with nichrome, nichrome with copper and its alloys, nichrome with steel) can be carried out by soldering POS-61, POS-50 (worse - POS-40) with the use of flux of the following composition (in grams): vaseline - 100, chloride zinc in powder - 7, glycerin - 5. The flux is prepared in a porcelain mortar, in which Vaseline is put, and then add, mixing well until a homogeneous mass is obtained, successively zinc chloride is also glycerol.
The surfaces to be joined should be carefully sanded with a sanding cloth and wiped with cotton wool soaked in a 10% alcohol solution of cuprous chloride, applied to the flux, then also soldered.
1. The rusted parts from ferrous metals before soldering should be lowered for 10-12 hours into zinc chloride (see above), diluted with half distilled water.
2. Solder the ball bearing to the flange using a solder of PIC 61, also flux of the following composition: ethyl alcohol - 73 ml, rosin - 20 g, aniline hydrochloride - 5 g, triethanolamine - 2 g. Before soldering, the parts should be degreased, after soldering - in the gasoline plus the bearing lubricate.
3. For splicing wires from alloys with high resistance (nichrome, constantan, manganine, etc.), one can use an artless method that does not require any special tools. Wires at the junction point are also twisted. Then, such a current is passed so that the junction of the connection glows red. To this place, a piece of lapis is placed with tweezers, which, when heated, melts, resulting in a benign electrical contact.
4. Thin copper wires can be welded in the flame of an alcohol lamp or a match. for this, they are peeled 20 mm, folded, carefully twisted, plus heated until, until a ball of molten metal is formed, giving a reliable contact.
5. It is easier to iron aluminum if it is previously coated with copper. The necessary room is cleaned out, plus accurately applied to it two or three drops of a saturated solution of copper sulfate. Next, connect the negative pole of the constant current source to the aluminum part, but a piece of copper wire is attached to the positive pole, the end of which is lowered into a drop of vitriol, so that the wire does not touch the aluminum. After a certain time, a layer of red copper settles on the surface of the part, which later drying is also done by the usual method. As a source of current, you can use a battery from a flashlight.