SPI means Solder Paste Inspection in PCB assembly industry. It’s work purpose is to check the solder paste deposits on the SMD component pads of bare printed circuit boards (PCBs) before loading the components on it . This is to sort out the potential flaws from solder paste printing process before forma SMT assembly.

All the assembly lines in WELLER is matched with SPI machine, this is much more safe and high quality rather than most other suppliers who do not use any SPI or just make solder paste inspection by eyes.