Surface Mount Technology (SMT) encompasses a series of assembly processes, which include single-sided assembly, single-sided mixed assembly, double-sided assembly, and double-sided mixed assembly. The fundamental components of these processes consist of solder paste printing (or dispensing), component placement (curing), reflow soldering, cleaning, and subsequent inspection and rework. The detailed procedures are outlined as follows:
Single-Sided Assembly:
- Incoming inspection
- Solder paste printing
- Application of solder paste (red glue)
- Component placement
- Reflow (curing)
- Cleaning
- Inspection
- Rework
Single-Sided Mixed Assembly:
- Incoming inspection
- A-side solder paste printing (red glue)
- Component placement
- A-side reflow (curing)
- Cleaning
- Through-hole insertion
- Wave soldering
- Cleaning
- Inspection
- Rework
Double-Sided Assembly:
- Incoming inspection
- A-side solder paste printing (red glue)
- Component placement
- A-side reflow (curing)
- Cleaning
- Board flipping
- B-side solder paste printing (red glue)
- Component placement
- B-side reflow (curing) or (DIP + wave soldering)
- Cleaning
- Inspection
- Rework
Double-Sided Mixed Assembly:
- Incoming inspection
- B-side solder paste printing (red glue)
- Component placement
- B-side reflow (curing)
- Cleaning
- Board flipping
- A-side solder paste printing (red glue)
- Component placement
- B-side reflow (curing) or (DIP + wave soldering)
- Cleaning
- Inspection
- Rework
The essential elements of SMT assembly include solder paste printing (or dispensing), component placement (curing), reflow soldering, cleaning, and inspection and rework. The materials utilized in these processes comprise standard circuit boards (rigid boards) and flexible circuit boards (soft boards).
The processing methods encompass PCB soldering, lead-free SMT surface mount assembly, through-hole assembly, SMD surface mounting, BGA soldering, BGA ball placement, BGA assembly, and surface mount packaging. The variety of products is extensive, featuring mobile circuit boards, automotive diagnostic tools, ultrasound devices, set-top boxes, routers, network media players, dash cameras, programmable logic controllers (PLCs), display controllers, spectrum analyzers, hair styling tools, and more.
