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What is SMT process? What processses are included?
Apr 08, 2018

SMT basic process components include: silk screen, placement (curing), reflow soldering, cleaning, testing, repair.


1, silk screen: (or dispensing) Its role is to paste the solder paste or patch glue printed on the PCB pad, to prepare for the welding of components. The equipment used is a screen printing machine (screen printer) located at the forefront of the SMT production line.


2. Dispensing: It is the fixed position where the glue drops onto the PCB. Its main function is to fix the components to the PCB. The equipment used is a dispenser, located at the front of the SMT production line or behind the inspection equipment.


3, Mounting: Its role is to accurately install the surface mounting components to the PCB's fixed position. The equipment used is a placement machine located behind the screen printing machine in the SMT production line. Well electronics use advanced FUJI NXTIII scalable placement platform for SMT assembly works.


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


5, reflow soldering: Its role is to melt the solder paste, so that the surface assembly components and PCB board firmly bonded together. The equipment used was a reflow oven located behind the placement machine in the SMT production line.


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


7. Inspection: Its role is to test the quality and assembly quality of assembled PCB boards. The equipment used is a magnifying glass, a microscope, an on-line tester (ICT), a flying probe tester, an automatic optical inspection (AOI), an X-ray inspection system, a function tester, and the like. The location can be configured in the right place on the production line according to the need of detection. With advanced ICT, SPI, AOI, visual inspection, Wells Electronics provide full inspection before soldering components.


8, Rework: Its role is to rework the faulty PCB board. The tools used are soldering iron, rework station and so on. Configured anywhere in the production line.

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