Mini SMT Reflow Oven User Manual
proper wave.
2. There are lot kinds of solder paste, every company chooses is also not
identical. For these reasons, we design this product can set eight waves, each
wave has three sections, each section of the heating time and temperature all
can alter. You can reset the heating waves according to the solder required
heating temperature and time.
Warm prompt: the machine after shutdown, if you want to restart,
the interval at least 5 s
Foundation for wave set
1. The reflow soldering theory and the temperature wave
When the PCB board goes into heat up area (dry area), the solvent and gas in
the solder paste will evaporate. At the same time, the flux can wet the pad and
the component tip and foot. The solder paste melts, caves in and covers the
pad, leading to the pad and component pins insulate the oxygen. PCB board
goes into heat preservation area. PCB board and components get full
preheating. In case of damaging the PCB and components when it goes into
the welding area and the temperature heats up quickly. When PCB board goes
into the welding area, the temperature heats up and the solder paste melts.
When PCB board goes in to cooling area, the liquid solder paste the soldering
points solidify. The reflow process is finished.
The temperature is the key to welding quality. The actual and the setting
temperature warming slope and the peak temperature should be accordant.
Before the temperature reaches 160
℃
, please control the heat up speed in
about 1
℃
/S. If heat up too quickly, the PCB board and the components will be
damaged, and the PCB board may be out of shape. On the other side, the flux
volatilizes too fast. And it is easy to make soldering tin ball. Set the peak
temperature 20
℃
-40
℃
higher than the solder paste melting point. Set the
reflow time 10S-60S. If the peak temperature is low or the reflow time is short,
it will affect the welding quality, and serious is causing the solder paste does
not melt. If the peak temperature is high or the reflow time is long, the metal
power will be oxidized and affect the welding quality and serious is causing the
component and PCB board damaged.
2. The set of the temperature wave
Set the wave according to the solder paste and the above foundation. Different
solder paste, choose and set different waves. In addition, the temperature