Tip 1: How to solder a resistor

According to most experts, for mounting resistors best option is a 25-watt soldering iron heats up to 3000 degrees.The fact that excessive overheating of the electronic components contribute to their premature failure.
you need
  • soldering, flux, solder, wire cutters, file, tweezers.
Guide
1
addition soldering required stand, solder POS-61 mark in the form of wire thickness in a single match.Do not forget flux - agent for degreasing and removal of oxide from the working surface.By the way, you can make it yourself.To do this you need to fill the vial with alcohol, to pour powdered rosin and shake until completely dissolved.If you are running on a normal table, then for his safety put him on a small piece of cardboard, plywood or complex.From the tool you probably need small pliers, file, tweezers and a scalpel, and from devices - digital tester.
2
heated soldering iron for 15-20 minutes, immerse it in the rosin and the next - in the solder.If the item is old, and the surface is cov
ered with oxide, it should be a good low-melting solder proludit.
3
When using solder paste squeeze it in place of soldering.Before soldering the chip in addition to the tracks on the circuit board cover with pasta and chips especially in the legs QFN.There pasta is good grease conclusions and cover them with a thin layer, the paste must not get under the base board QFN.
4
If you decide to solder the chip to the board, where the body has vias and tracks, it is better to break off the heat-removing base cover.This is done with a round or square rod of copper having a thickness half times smaller than the width of the heat sink base.
5
After that, not much in a vise clamp chip by placing the jaws of paper napkins, bar and careful movements broke out basis.Soldering tip is applied to the resistor across the spatula.Thus, to ensure a more efficient heat transfer and make soldering more quickly and efficiently.In order to evaporate the flux at the time of soldering, apply it before the brazing, when everything is ready to go.Good soldering is characterized by a thin, smooth, shiny layer of solidified solder without sagging and cracking.

Tip 2: How to solder steel

brazing metal is widely used in electronics, electrical engineering, and in the tool business.When soldering pieces in most cases the use of lead-tin solder.But they are suitable mainly for the connection of copper parts.If you want to create a permanent connection steel products, you need to first prepare a special refractory solder.
As soldering steel
you need
  • - copper;
  • - zinc;
  • - silicon;
  • - Nickel;
  • - graphite crucible;
  • - charcoal;
  • - gas burner;
  • - powerful soldering iron (soldering station).
Guide
1
To prepare the first type of brazing, prepare a graphite crucible, charcoal, zinc and copper.Place the container in a weight ratio of 45% copper and 55% zinc.Melt the composition of a layer of charcoal.To increase the strength of solder can be added 0.3% silicon.Immediately after melting the mixture and pour the mix into small shapes.Such solder suitable for soldering of steel in the temperature range of 850-880 degrees.
2
If you need a higher temperature, need to change a few percentages of the alloy components.Described method, melt and blend of 60% copper and 40% zinc.Such a composition will have a yellowish color.
3
To prepare solder pure white Take 15% nickel, 25% zinc and 60% copper.Place the metal in the crucible, pour charcoal and melt to obtain a homogeneous mass.Do not forget to stir the cooked part of preparation.
4
as a flux for soldering steel, use a rust converter, which can be purchased at auto parts stores.It contains zinc chloride and phosphoric acid.Flux is used for the treatment of the surfaces with the obligatory washing soap.
5
Soldering sufficiently massive steel important parts of preheat.Use a small gas burner, and after the metal heats up, maintain the required temperature soldering iron.
6
The rest soldering technology steel products is no different from the compounds of other materials.Parts to be soldered, pre-clean of dirt and rust and treat with solvent.
7
properly prepare the soldering tip.To do this, carefully clean it with sandpaper to clean copper.Then rub the sting of a piece of aluminum, so it does not burn longer.It is advisable to have a built-in soldering temperature controller.In the ideal case, soldering steel parts desirable to use a soldering station.

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