The basic elements of the smt process: silk screen printing, dispensing, placement, curing, reflow soldering, cleaning, testing, and repair.

Silk screen printing: Its function is to print solder paste or patch glue onto the pads of PCB to prepare for the soldering of components. The equipment used is a screen printing machine (screen printing machine), SMT patch stencil, which is located at the front end of the SMT production line.

Glue dispensing: It is to drop glue onto the fixed position of the PCB, and its main function is to fix the components to the PCB. The equipment used is a glue dispenser, which is located at the front end of the SMT production line or behind the testing equipment. Mounting: Its function is to accurately install surface mount components to a fixed position on the PCB. The equipment used is a placement machine, which is located behind the screen printing machine in the SMT production line.

Curing: Its function is to melt the patch adhesive, so that the surface mount components and the PCB board are firmly bonded together. The equipment used is a curing oven, which is located behind the placement machine in the SMT production line.

Reflow soldering: Its function is to melt the solder paste, so that the surface mount components and the PCB board are firmly bonded together. The equipment used is a reflow oven, which is located behind the placement machine in the SMT production line.

Cleaning: Its function is to remove the welding residues harmful to human body such as flux on the assembled PCB board. The equipment used is a washing machine, and the location may not be fixed, online or offline.

Inspection: Its function is to inspect the welding quality and assembly quality of the assembled PCB board. The equipment used includes magnifying glass, microscope, online tester (ICT), flying probe tester, automatic optical inspection (AOI), X-RAY inspection system, functional tester, etc. The location can be configured in a suitable place on the production line according to the needs of detection.

Rework: Its function is to rework the PCB boards that have detected failures. The tools used are soldering iron, rework station, etc. Configured anywhere in the production line.

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