Basic requirements for soldering points of electric soldering irons
1. The solder joints must have sufficient mechanical strength to ensure that the parts to be welded will not fall off or loosen when subjected to vibration or impact. Do not use too much solder to accumulate, as this can easily cause false soldering and short circuits between solder joints.
2. The welding is reliable and has good conductivity. Welding must be prevented. False welding means that there is no alloy structure formed between the solder and the surface of the welded part. It simply adheres to the surface of the metal being welded.
3. The surface of the solder joints should be smooth and clean. The surface of the solder joints should have good luster. There should be no burrs, voids, and no dirt, especially the harmful residual substances of the flux. It is necessary to choose the appropriate solder and flux.
Basic operation methods of manual welding
• Preparation before welding
Prepare the soldering iron, tweezers, scissors, diagonal pliers, needle-nose pliers, solder, flux and other tools. Tin the soldering iron and welding parts. Hold the solder in your left hand and the soldering iron in your right hand to keep it ready for soldering at any time.
• Use a soldering iron to heat the parts to be welded.
• Feed in the solder and melt the appropriate amount of solder.
• Remove solder.
• When the solder flows and covers the solder joint, quickly remove the soldering iron.
Master the welding temperature and time. When welding, there must be sufficient heat and temperature. If the temperature is too low, the fluidity of the solder is poor, and it is easy to solidify, forming a virtual solder; if the temperature is too high, the solder will flow, making it difficult to store tin in the solder joints, and the decomposition speed of the flux will be accelerated, which will accelerate the oxidation of the metal surface and cause the printed circuit board to be damaged. The solder pads on it came off. Especially when using natural rosin as flux, if the soldering temperature is too high, it will easily oxidize and peel, resulting in carbonization, resulting in a weak solder.
