Nowadays, both the plug-in lamp bead and the patch lamp bead need to be reflow soldered, so the lamp bead can basically pass 240 ° C high temperature.
LED lamp bead reflow soldering must be set to the temperature of reflow soldering, otherwise it is easy to cause the irreversible loss of the dead bulb phenomenon of the batch lamp bead. Then how to do LED reflow does not cause such unnecessary losses. Jing Chonghong explains it for everyone here.
First, the LED reflow soldering temperature curve must be adjusted after the first board has been confirmed after various quality confirmations. This is the first confirmation work in the factory quality management.
Second, LED reflow soldering must be done before the welding work to see the LED lamp bead factory specifications, see its various technical parameters
1, to see the temperature resistance of LED lamp bead packaging materials;
2, depends on the LED welding substrate is what material, such as general PCB (fiberboard, etc.), aluminum substrate, ceramic plate, etc.;
3, to see the solder, is high temperature or low temperature solder paste, or resin;
4, according to the actual quality of LED reflow soldering equipment, look at the number of LED reflow soldering zone, extreme flow rate, fan, temperature control of each zone and other parameters.
Third, LED reflow soldering LED lamp beads general adjustment parameters reference
The minimum temperature is 150-170 degrees, the maximum temperature is preferably 240-245 degrees (up to 260, if 245 degrees can dissolve tin, do not adjust to 260), the time above 220 degrees can not exceed 60 seconds, If the temperature is raised, the 260 degree time cannot exceed 10 seconds. If it is 7 temperature zone, please refer to the following settings: 160, 170, 175, 180, 190, 210, 245, 220. If the LED lamp bead is a silicone lens, you can use BI58SN42 solder paste, the maximum temperature is 225 degrees Celsius. If it is a PC lens, reflow soldering cannot be used at all.
Basically, this is the general explanation of lamp beads over reflow soldering.