IRDA-WELDER T-890 USER MANUAL
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For these reasons, we design this product can set eight waves, each wave has eight
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.
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. PCB board goes into cooling area.
Then 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
.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
