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Two basic process methods for SMT surface assembly installation and welding
Oct 17,2024
The installation and welding of SMT surface assembly parts mainly use automated installation and welding methods (such as wave soldering, reflow soldering, etc.) for installation and welding. The installation and welding of surface mount components are mainly divided into two basic process methods, namely solder paste/reflow soldering process and patch adhesive/wave soldering process.
1. Welding paste/reflow soldering process
The production line for solder paste/reflow soldering mainly focuses on the installation and soldering of SMD components. It consists of three major equipment: solder paste printing, surface mount machine, and reflow soldering furnace. It first inserts and then welds different plug-in components. It first applies solder paste on the solder pads of the printed circuit board, and then uses a high-precision automated equipment that integrates light, electricity, gas, and machinery to mount the components on the solder pads coated with solder paste in front. Finally, it is heated in a reflow oven to melt the solder paste again, so that the surface mounted components are firmly soldered to the solder pads.
2. SMT adhesive/wave soldering process
When it is necessary to install a mixture of surface mount components and traditional socket components on a printed circuit board, the process of surface mount adhesive/wave soldering is used. This process involves first applying adhesive to the gap between the solder pads on the A-side, attaching the surface mount component to the A-side of the circuit board, and then flipping it over. On the B-side, through-hole components are connected, so that the pins of the through-hole and the surface mount components are on the A-side, which is the lower board. After wave soldering, both the plug-in and surface mount components can be soldered on. The SMT/wave soldering process is inexpensive, but requires a large amount of equipment, making it difficult to achieve high-density assembly.
A reasonable assembly process is the guarantee of quality and efficiency. After confirming the surface assembly method, the process flow can be confirmed according to the needs and specific equipment conditions. Different assembly methods have different process flows, and the same assembly method can also have different process flows, which mainly depend on the type of material and the quality requirements of surface treatment.
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