SMT Surface Mounting Process For Solder Paste Printing / Component Placement / Reflow Soldering

The SMT surface mounting process includes procedures such as solder paste printing , component placement and reflow soldering .

The SMT surface mount process centers on three interconnected core procedures: solder paste printing, component mounting, and reflow soldering, forming a precise, automated, and controllable electronic assembly technology system covering the entire workflow. It features core advantages of high precision, outstanding consistency, superior efficiency and exceptional reliability.

1. Technical Characteristics:

- For the solder paste printing stage, stencil apertures are precisely aligned with PCB pads. Coordinated control of adjustable squeegee pressure, travel speed and separation clearance, paired with a constant temperature and humidity workshop environment, enables micro-level accurate solder paste deposition. This eliminates pre-soldering defects such as insufficient solder, cold solder joints and solder balls, and meets the soldering requirements of ultra-fine pitch pads.

- The SMT mounting process adopts high-precision placement equipment equipped with visual positioning and servo drive systems. It enables stable, accurate picking and placement of tiny resistors and capacitors, BGA, QFN and other special-shaped packaged components, satisfying both the mounting demands of PCBs with high-density wiring and the positioning precision requirements of irregular components.

- Zoned temperature-controlled furnaces are used for reflow soldering. Four standardized temperature zones (preheating, constant-temperature soaking, melting soldering and cooling solidification) deliver gradient heating, which precisely matches the melting properties of various solder pastes including leaded, lead-free and high-temperature specialized types. The heating rate and peak soldering temperature can be accurately regulated. Combined with nitrogen protection technology, solder joint oxidation is effectively reduced and solder wettability is improved, ultimately forming standardized solder joints with stable electrical performance and qualified mechanical strength.

2. Application Fields:

This integrated SMT process is widely applied across all categories of electronic manufacturing and serves as the mainstream core technology for surface mounting of electronic components today. It is used for mainboard assembly of terminal products, accommodating the design requirements of miniaturized, high-density circuit layouts and ultra-thin lightweight structures, and meeting the long-term operation demands under vehicle-mounted high-low temperature conditions and complex industrial electromagnetic environments. In the precision electronics sector, its micro-level printing and mounting accuracy and low-defect-rate process performance comply with strict standards of high-end equipment for stable electrical connections and product safety.

3. Customized Personalized Services:

Full-range customized services can be provided tailored to customers’ product characteristics, performance requirements and production scales. Meanwhile, archiving and reuse of exclusive customer process parameters are supported to guarantee consistent quality across multiple production batches, fully catering to differentiated production and quality demands of various clients.