Summary of Key Points for Electric Soldering Iron Welding Technology
1. Welding method
Welding, inspection, and cutting short
Hold an electric soldering iron in the right hand and use pointed nose pliers or tweezers to clamp components or wires in the left hand; Before welding, the soldering iron should be fully preheated, and the blade surface of the soldering iron tip should be coated with solder, that is, a certain amount of solder should be added.
Place the tip of the soldering iron tightly against the solder joint, with the soldering iron at an angle of approximately 60 ° C to the horizontal plane, so that melted tin flows from the tip onto the solder joint. Control the duration of the soldering iron tip's stay at the solder joint to 2-3 seconds.
Lift the soldering iron tip and hold the component in your left hand until the tin at the solder joint cools and solidifies before releasing your left hand.
Use tweezers to rotate the lead wire to confirm that it is not loose, and then use side cutters to cut off excess lead wire.
2. Welding quality
When welding, it is necessary to ensure that each welding point is firmly welded and has good contact, and to ensure the welding quality.
A good solder joint should have a bright, smooth and burr free solder spot, moderate amount of solder, firm fusion of solder and the object being welded, and no virtual or false soldering. Virtual soldering refers to the situation where only a small amount of solder is attached to the solder joint, resulting in poor contact and intermittent continuity.
Fake soldering refers to the situation where it appears to be soldered on the surface, but in reality it is not soldered. Sometimes, by manually pulling out the lead wire, it can be removed from the solder joint. These two situations will bring great difficulties to the debugging and maintenance of electronic production. Only through extensive and serious soldering practice can these two situations be avoided.
When soldering circuit boards, it is important to control the timing. If the circuit board is too long, it may burn or cause the copper foil to peel off. When disassembling components from the circuit board, you can place the soldering iron tip on the solder joint and wait for the tin on the solder joint to melt before pulling out the component.
Flux (rosin and soldering oil) is crucial during welding. Fresh rosin and non corrosive soldering oil can help you complete the welding well and make the surface smooth and beautiful. You can use more flux when using it.
