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What is SMT process flow? What are included?
Mar 20, 2018

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

1, silk screen: 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.

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.

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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