The electric iron should heat the pad. Do the solder wire melt on the pad or solder the solder on the soldering iron to the pad?
The electric iron head is placed on the welding pad first, and the solder wire is pressed on the contact surface. The contact surface is the soldering disc or the soldering iron head
Welding seems simple, and actually it is also a sophisticated technology. There is no standard procedure for specific welding operations, because the welding processes are different between different workpieces or under different conditions. The first step is to clean the iron head, thoroughly clean the iron head, and evenly coat the tin after heating. This step does not seem to matter, but it is an important foundation for the next step of welding. When welding, choose high quality solder, the quality of solder is too bad, not only affect the welding efficiency and quality, but also damage the weldment. High quality solder, solder joints have bright, poor quality solder, solder after welding white without light. When welding in most cases will tip top gently in the welding position, you say the pads or solder joints, wait after the heating wire to the solder melting, soldering tin mainly observe the degree of saturation in the melting process, the shape of satisfaction do now. Welding workpiece larger, there is no high-power iron, but also can use external heating method, welding non heat resistant workpiece, to be steady, accurate, fast, to advance welding tin for welding. The main flux, strong acid type zinc chloride, used for welding thick pieces of copper and tin. Medium acid solder paste for soldering smaller components. The above two soldering fluxes shall not be used for welding electrical wiring. Welding electrical wiring is commonly used weak acid rosin, rosin easy to evaporate, welding temperature should not be too high, welding lead wire remember to advance tin, so that more easily welding.
If the pad is a workpiece, the pad should not be heated, otherwise the solder will not solidify before the pad cools and will lead to solder lossThe correct way is to should be in soldering iron head melting, welding parts will need to apply the soldering iron head, or soldering iron head and at the same time in the welding position. If the workpiece is too large, the heat is not easy to gather, the occurrence of solder early solidification, must use the power of electric iron more.
