Wave soldering development brief refers to the molten solder paste (pewter), the electric pump or an electromagnetic pump jet stream into the design requirements of the solder wave can also be formed by a solder pool to inject nitrogen gas in advance PCB mounted components through the solder wave, soft soldering or welding ends between the components and the PCB pad pin mechanical and electrical connection. Wave soldering process: the element into the corresponding holes in → precoat element flux → preheating (temperature 90-100 ℃, length 1-1.2m) → Wave (220-240 ℃) cooling → removal of excess widget foot → Check . Reflow soldering process is by re-melting previously allocated to the PCB solder paste solder pads, soft soldering surface mount components between the pin and solder terminals or PCB pad mechanical and electrical connections . Wave as people's awareness of environmental protection, a new welding process. Before the tin-lead alloy, but the lead is a heavy metal on the human body great harm. So motivated the lead-free process, using tin-silver-copper alloy * * and special flux, and higher soldering temperature requirements preheat temperature. Most do not need to miniaturization and power products still in use perforation (TH) or mixed technology circuit boards, such as televisions, home audio and video equipment and digital set-top boxes, we are still in with a piercing element, and therefore need to use Crest welding. From the process perspective, wave soldering machines can only provide very little basic equipment operating parameter adjustment. 2 Process the board after a conveyor belt into the wave soldering machine, will go through some form of flux coating apparatus where the use of the peak flux, foam or spray coating method to the circuit board. Since most of the flux in the welding must achieve and maintain an activation temperature to ensure complete wetting of solder joints, so the board before entering the crest trough through a preheating zone first. After preheating the flux coating can gradually raise the temperature of the PCB and flux activation, this process can reduce the thermal shock generated when entering the peak assembly. It can also be used to evaporate the carrier solvent can absorb all the moisture flux or diluted, if these things are not removed, it will boil over during peak solder and cause sputtering, or vapor generated in the solder leaving a hollow inside The solder or trachoma. In addition, due to the large double-sided and multilayer heat capacity, so they need higher than the single-panel preheat temperature. At present wave soldering machine is basically the way to preheat thermal radiation, the most common methods of wave forced hot air convection preheating, the convection electric panels, electric heating rods and infrared heating. In these methods, forced hot air circulation is often considered most processes in the most efficient heat wave machine delivery method. After preheating, circuit boards with a single wave (λ wave) or double wave (spoiler wave and λ wave) mode for welding. Perforated element in terms of a single wave is sufficient, when the circuit board into the crest, solder flow direction opposite the direction of travel and the board can swirl around the device pin. It's like a wash, the residue of flux and above all the removal of the oxide film formed during infiltration infiltration temperature solder arrive. For mixed technology assembly, usually in front of λ wave also uses a spoiler wave. This Bobby narrow, with a high vertical pressure when disturbed, can penetrate well between the solder pads placed compact pin and surface mount components (SMD), and then complete the solder wave molding λ . Before the coming of equipment and suppliers to make any assessment, we need to determine all the technical specifications of the board with a crest welding because they can determine the required machine performance. Guangdong wave plant, factory Shenzhen wave, wave soldering plant in Dongguan, Guangzhou wave plant, Zhongshan wave plant, Foshan wave soldering plant.