How wave soldering works
Wave soldering means that the molten solder (lead-tin alloy) is sprayed by an electric pump or an electromagnetic pump to form a solder wave peak required by the design. It can also be formed by injecting nitrogen into the solder pool, so that the pre-installed laser steel mesh brush The printed board of the tin chip component passes through the solder wave to realize the soldering of the mechanical and electrical connection between the solder end of the component or the pin and the pad of the printed board. There are many types of wave soldering systems, depending on the wave geometry used by the machine.
Wave soldering process: insert components into corresponding component holes → pre-coat flux → pre-baking (temperature 90-1000C, length 1-1.2m) → wave soldering (220-2400C) → cut off excess plug-in feet → check. The reflow soldering process is to achieve soldering of the mechanical and electrical connections between the surface mount component terminals or pins and the printed board pads by remelting the creamy solder that is pre-distributed on the printed board pads .
Wave soldering has a new welding process with the enhancement of people’s awareness of environmental protection. The previous ones used tin-lead alloys, but lead is a heavy metal that does great harm to the human body. So now there is a lead-free process. It uses * tin-silver-copper alloy * and special flux, and the soldering temperature requires a higher preheating temperature. In addition, a cooling zone workstation should be set up after the PCB board passes through the soldering zone. This aspect is to prevent On the other hand, thermal shock will affect the detection if there is ICT.
Perforated (TH) or mixed technology circuit boards are still used in most products that do not require miniaturization, such as televisions, home audio-visual equipment, and upcoming digital set-top boxes. weld. From a process point of view, wave soldering machines can only provide a few adjustments to the most basic equipment operating parameters.
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