Inspection after soldering with soldering iron
After the end of welding must check for leakage, soldering and short-circuiting of components due to the flow of solder. Virtual welding is more difficult to find, available tweezers clamped component pins gently pull, such as found shaking should be immediately replenished welding
Soldering iron is the most commonly used tool in electronic soldering, the role is to convert electrical energy into heat on the welding point parts of the heating and welding, and whether its success is a large part is to see how well it is manipulated, so a certain point of view on the use of the soldering iron relies on the use of a method of feeling.
Generally speaking, the greater the power of the soldering iron, the greater the heat, the higher the temperature of the soldering iron head. General transistors, integrated circuits, electronic components welding selection of 20W endothermic soldering iron is enough, too much power is easy to burn components, because the diode, transistor junction temperature of more than 200 ℃ will be burned. However, the main gallows welding in the production of bile, soldering iron power to be larger, can be selected in the 35W-45W, or even larger.
It is worth noting that the line welding, the time can not be too long nor too short, too long time is also easy to damage, and time is too short solder can not be fully melted, resulting in solder joints are not smooth and not firm, but also may produce a false soldering, in general, the most appropriate time must be completed in 1.5s ~ 4s.
Solder is a fusible metal, the most commonly used is generally solder wire. The role of the solder is to make the component pins and printed circuit board connection points connected together, the choice of solder has a great impact on the quality of welding. Now the most commonly used is generally contained rosin solder wire, but the breakdown is also quite delicate, which is really not mixed with water containing silver solder wire is of course the top grade.
It is also worth mentioning the tin absorber, which is very practical for novices, the first time to use the soldering iron is always easy to get the solder everywhere, the tin absorber can help you get rid of the excess solder on the circuit board. In addition, the tin absorber in the removal of multi-leg integrated circuit device is very effective and useful, it can be all the soldering points sucked off, and for people who can skillfully use a soldering iron is completely unnecessary, with a soldering iron can completely replace its function, the soldering point will be melted off can be very easy to take out the components.
Before welding, the component pins or circuit board should be soldered parts of the pre-soldering treatment.
Remove the oxidized layer of the welding site ---- can be broken saw blade made of knife, scrape off the surface of the metal lead oxide layer, so that the pins reveal the metal luster. Printed circuit boards can be used fine gauze paper to lighten the copper foil, coated with a layer of rosin alcohol solution.
Component tinning ---- tinned on the scraped clean leads. Leads can be dipped into a rosin alcohol solution, the hot soldering iron with tin head pressed on the lead, and turn the lead. It can make the leads evenly plated with a very thin layer of tin. Before welding the leads, the insulation should be stripped off the outer skin, and then after the above two treatments, before the formal welding. In case of multi-stranded wire leads, they should be screwed together after being lightened and then tinned.
