Electronics assembly lines face ongoing decisions on through-hole soldering methods as PCBs grow denser and production mixes SMT with THT. Wave soldering applies a continuous solder wave across the board underside, suiting stable high-volume output where designs change little. Selective soldering uses programmable nozzles to apply solder to specific joints, offering control suited to variable batches or complex layouts.
Wave delivers high throughput with lower initial costs but risks defects—bridging in tight areas, shadowing under tall components, broad thermal exposure stressing nearby SMDs. Fixtures mask sensitive zones; dross and solder consumption rise. Selective limits heat to targeted spots, cuts waste, reduces fixture needs, but requires programming skill and accepts longer cycles on dense boards.
A manufacturer in Mexico producing beauty-care electronics (skincare tools, electronic brushes) installed a full SMT+DIP line including wave and selective stations. Initial wave-only runs saw rising defects from design shifts and density. After I.C.T engineers completed on-site installation, commissioning, and operator training, the line achieved consistent quality. Defects fell in line with typical mixed-tech improvements (20-30% range), production stabilized despite frequent changes.
In Uruguay a smart electric meter factory implemented a complete SMT+DIP line emphasizing selective soldering for precision on power circuits. Engineers provided full setup support and training; output reached stable levels quickly, supporting reliable high-demand production.
These examples illustrate the need to evaluate PCB through-hole distribution, batch stability, and total ownership costs—equipment, materials, maintenance, rework—before selection. I.C.T supplies SS550 series selective machines within integrated lines, with global service ensuring quick ramp-up.
For detailed comparison of process fit, refer to industry resources like practical soldering guides.