The Selective Soldering Machine- ESS is the completely automated "in-line" version handling boards up to 18" x 24". It has a SMEMA pass through conveyor that features automatic conveyor width adjustment and a "crowder" to facilitate positive location of the board. The board is maintained stationary during the soldering process preventing components from toppling over causing "unset" inter-metallic fillets. The ESS couples high throughput with precise process controls. The programmable features provide the tools to set all process parameters, including immersion depths, pre-heat dwells, travel distances and speeds, solder temperature and wave height. Once set, the system will repeat precisely. The ESS will out-produce 6 or more operators soldering with an iron while significantly increasing the solder joint quality and to a predictable schedule.