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The difference between reflow soldering and wave soldering in PCBA processing
2023-12-23
In PCBA processing, two common soldering methods are reflow soldering and wave soldering. So in PCBA processing, what is the role of reflow soldering, what is the role of wave soldering, and what is the difference between them?
1. Reflow soldering:
It refers to the electrical interconnection between the pins or solder ends of electronic components pre-mounted on the pads and the pads on the PCB by heating and melting the solder paste pre-coated on the pads, so as to achieve the purpose of soldering the electronic components on the PCB board. Reflow soldering is generally divided into a preheating zone, a heating zone, and a cooling zone.
Reflow soldering process: printing solder paste→mounting components→reflow soldering→cleaning
2. Wave soldering:
A pump is used to jet the molten solder into a solder crest, and then the pins of the electronic components that need to be soldered are passed through the solder crest to realize the electrical interconnection between the electronic components and the PCB board. A wave soldering is divided into four parts: spraying, preheating, tin oven and cooling.
Wave soldering process: plug-in→apply flux→preheat→wave soldering→cut off corners→check.
3. The difference between wave soldering and reflow soldering:
(1) Wave soldering is the formation of molten solder to form a solder wave to solder the components; Reflow soldering is the formation of high-temperature hot air to form reflow melting solder to solder components.
(2) When reflow soldering, there is already solder before the PCB is put on the furnace, and the coated solder paste is melted and soldered after soldering, and when wave soldering, there is no solder before the PCB is put on the furnace, and the solder wave generated by the welding machine coats the solder on the pad that needs to be soldered to complete the soldering.
(3) Reflow soldering is suitable for SMD electronic components, and wave soldering is suitable for pin electronic components.
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