1. Welding materials

　　1) The solder usually adopts Sn60 or Sn63 solder that meets the general standard of the United States, or adopts HL-SnPb39 type tin lead solder.

　　2) The flux can usually be rosin flux or water-soluble flux, the latter is generally only used for wave soldering.

　　3) The cleaning agent should ensure that the PCB board is non-corrosive and pollution-free, generally using anhydrous ethanol (industrial alcohol), trichlorotrifluoroethane, isopropanol (IPA), aviation washing gasoline and deionized water and other cleaning agents for cleaning. The specific cleaning agent used should be selected according to the process requirements.

　　2. Welding tools and equipment

　　1) The reasonable selection of the power and type of soldering iron has a direct relationship to improving welding quality and efficiency. It is recommended to use low-voltage temperature-controlled electric soldering iron, the soldering iron head can be nickel plated, iron plated or copper material, the shape should be determined according to the needs of welding.

　　2) Wave peak welding machine and reflow welding machine is one of the welding equipment suitable for industrial mass production.

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