What is reflow soldering?
Reflow soldering refers to heating and melting the solder paste pre-coated on the pad to realize the electrical interconnection between the pins or solder terminals of the electronic components pre-mounted on the pad and the pad on the pcb, so as to achieve the electronic The purpose of soldering components on the PCB. Reflow soldering relies on the action of hot gas flow on solder joints. The colloidal flux undergoes a physical reaction under a certain high-temperature gas flow to achieve SMD welding; so it is called "reflow soldering" because the gas circulates in the welding machine to generate high temperature to achieve welding. Reflow soldering is generally divided into preheating zone, heating zone and cooling zone.
What is wave soldering?
The molten solder (lead-tin alloy) is sprayed into the solder wave required by the design through the electric pump or electromagnetic pump, so that the printed board pre-installed with components passes through the solder wave to realize the soldering end or pin of the component Soldering of mechanical and electrical connections to printed board pads. The wave soldering machine is mainly composed of a conveyor belt, a flux adding area, a preheating area and a wave tin furnace, and its main material is solder bar.
The difference between reflow soldering and wave soldering
1. Wave soldering is the melting of solder to form a solder wave to solder the components; reflow soldering is the formation of high-temperature hot air to reflow molten solder to solder the components.
2. The process is different: wave soldering needs to spray flux first, and then go through preheating, welding, cooling zone, reflow soldering, there is already solder on the pcb before it is put on the furnace, after soldering, only the coated solder paste is melted for soldering, wave soldering At this time, there is no solder before the pcb is put into the furnace, and the solder wave generated by the welding machine spreads the solder on the pads 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.
