In recent electronic PCB board industry developments, reflow soldering has emerged as a dominant trend, enabling the reflow soldering of even through-hole components (known as through-hole reflow soldering) to minimize production costs by completing all solder joints simultaneously. However, for temperature-sensitive components, whether plug-in or SMD, the focus has shifted to selective soldering, which complements reflow soldering in most applications. Selective soldering targets specific areas, minimizing heat transfer and allowing for efficient soldering of through-hole components, crucial for future lead-free processes.